diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index e60736e6..2d08e232 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -40,7 +40,7 @@ import { ProjectService } from './services/project.service';
 import { SymbolService } from "./services/symbol.service";
 import { ServerService } from "./services/server.service";
 import { IndexedDbService } from "./services/indexed-db.service";
-import { HttpServer } from "./services/http-server.service";
+import { HttpServer, ServerErrorHandler } from "./services/http-server.service";
 import { SnapshotService } from "./services/snapshot.service";
 import { ProgressDialogService } from "./common/progress-dialog/progress-dialog.service";
 import { NodeService } from "./services/node.service";
@@ -79,14 +79,21 @@ import { LocalServerComponent } from './components/local-server/local-server.com
 import { ProgressComponent } from './common/progress/progress.component';
 import { ProgressService } from "./common/progress/progress.service";
 import { version } from "./version";
-import { ToasterErrorHandler } from "./toaster-error-handler";
+import { ToasterErrorHandler } from "./common/error-handlers/toaster-error-handler";
+import { environment } from "../environments/environment";
+import { RavenState } from "./common/error-handlers/raven-state-communicator";
 
 
-Raven
-  .config('https://b2b1cfd9b043491eb6b566fd8acee358@sentry.io/842726', {
-    release: version
-  })
-  .install();
+if (environment.production) {
+  Raven
+    .config('https://b2b1cfd9b043491eb6b566fd8acee358@sentry.io/842726', {
+      shouldSendCallback: () => {
+        return RavenState.shouldSend;
+      },
+      release: version
+    })
+    .install();
+}
 
 
 @NgModule({
@@ -166,7 +173,8 @@ Raven
     SymbolsDataSource,
     SelectionManager,
     InRectangleHelper,
-    DrawingsDataSource
+    DrawingsDataSource,
+    ServerErrorHandler
   ],
   entryComponents: [
     AddServerDialogComponent,
diff --git a/src/app/raven-error-handler.spec.ts b/src/app/common/error-handlers/raven-error-handler.spec.ts
similarity index 81%
rename from src/app/raven-error-handler.spec.ts
rename to src/app/common/error-handlers/raven-error-handler.spec.ts
index 6ca84027..a229b3d0 100644
--- a/src/app/raven-error-handler.spec.ts
+++ b/src/app/common/error-handlers/raven-error-handler.spec.ts
@@ -1,9 +1,9 @@
 import { TestBed } from '@angular/core/testing';
 import { PersistenceService } from "angular-persistence";
 
-import { SettingsService } from "./services/settings.service";
+import { SettingsService } from "../../services/settings.service";
 import { RavenErrorHandler } from "./raven-error-handler";
-import { environment } from "../environments/environment";
+import { environment } from "../../../environments/environment";
 
 
 describe('RavenErrorHandler', () => {
@@ -31,11 +31,11 @@ describe('RavenErrorHandler', () => {
   it('should handle error', () => {
     settingsService.set('crash_reports', true);
     environment.production = true;
-    expect(handler.shouldSend()()).toBeTruthy();
+    expect(handler.shouldSend()).toBeTruthy();
   });
 
   it('should not handle when crash reports are disabled', () => {
     settingsService.set('crash_reports', false);
-    expect(handler.shouldSend()()).toBeFalsy();
+    expect(handler.shouldSend()).toBeFalsy();
   });
 });
diff --git a/src/app/common/error-handlers/raven-error-handler.ts b/src/app/common/error-handlers/raven-error-handler.ts
new file mode 100644
index 00000000..005fb537
--- /dev/null
+++ b/src/app/common/error-handlers/raven-error-handler.ts
@@ -0,0 +1,21 @@
+import { ErrorHandler, Inject, Injector } from "@angular/core";
+
+import { SettingsService } from "../../services/settings.service";
+import { environment } from "../../../environments/environment";
+import { RavenState } from "./raven-state-communicator";
+
+
+export class RavenErrorHandler implements ErrorHandler {
+  constructor(@Inject(Injector) protected injector: Injector) {}
+
+  handleError(err: any): void {
+    RavenState.shouldSend = this.shouldSend();
+
+    console.error(err.originalError || err);
+  }
+
+  shouldSend() {
+    const settingsService: SettingsService = this.injector.get(SettingsService);
+    return environment.production && settingsService.get('crash_reports');
+  }
+}
diff --git a/src/app/common/error-handlers/raven-state-communicator.ts b/src/app/common/error-handlers/raven-state-communicator.ts
new file mode 100644
index 00000000..7a099177
--- /dev/null
+++ b/src/app/common/error-handlers/raven-state-communicator.ts
@@ -0,0 +1,5 @@
+export class RavenStateCommunicator {
+  public shouldSend = true;
+};
+
+export var RavenState = new RavenStateCommunicator();
diff --git a/src/app/toaster-error-handler.spec.ts b/src/app/common/error-handlers/toaster-error-handler.spec.ts
similarity index 68%
rename from src/app/toaster-error-handler.spec.ts
rename to src/app/common/error-handlers/toaster-error-handler.spec.ts
index 679f8f49..10fbb578 100644
--- a/src/app/toaster-error-handler.spec.ts
+++ b/src/app/common/error-handlers/toaster-error-handler.spec.ts
@@ -1,8 +1,10 @@
 import { TestBed } from '@angular/core/testing';
-import { ToasterService } from "./services/toaster.service";
-import { MockedToasterService } from "./services/toaster.service.spec";
+import { ToasterService } from "../../services/toaster.service";
+import { MockedToasterService } from "../../services/toaster.service.spec";
 import { ToasterErrorHandler } from "./toaster-error-handler";
 import { RavenErrorHandler } from "./raven-error-handler";
+import { SettingsService } from "../../services/settings.service";
+import { MockedSettingsService } from "../../services/settings.service.spec";
 
 
 describe('ToasterErrorHandler', () => {
@@ -13,6 +15,7 @@ describe('ToasterErrorHandler', () => {
     TestBed.configureTestingModule({
       providers: [
         { provide: ToasterService, useClass: MockedToasterService },
+        { provide: SettingsService, useClass: MockedSettingsService },
         RavenErrorHandler,
         ToasterErrorHandler,
       ]
diff --git a/src/app/toaster-error-handler.ts b/src/app/common/error-handlers/toaster-error-handler.ts
similarity index 63%
rename from src/app/toaster-error-handler.ts
rename to src/app/common/error-handlers/toaster-error-handler.ts
index eabe381c..a1d0d71b 100644
--- a/src/app/toaster-error-handler.ts
+++ b/src/app/common/error-handlers/toaster-error-handler.ts
@@ -1,5 +1,5 @@
 import { RavenErrorHandler } from "./raven-error-handler";
-import { ToasterService } from "./services/toaster.service";
+import { ToasterService } from "../../services/toaster.service";
 
 
 export class ToasterErrorHandler extends RavenErrorHandler {
@@ -8,8 +8,7 @@ export class ToasterErrorHandler extends RavenErrorHandler {
     super.handleError(err);
 
     const toasterService = this.injector.get(ToasterService);
-    const error = err.originalError || err;
-    toasterService.error(error.message);
+    toasterService.error(err.message);
   }
 
 }
diff --git a/src/app/common/progress/progress.component.html b/src/app/common/progress/progress.component.html
index c240c710..9778c6d6 100644
--- a/src/app/common/progress/progress.component.html
+++ b/src/app/common/progress/progress.component.html
@@ -1,8 +1,20 @@
-<div class="overlay" *ngIf="visible">
-  <div class="loading-spinner">
+<div class="overlay" *ngIf="visible || error">
+  <div class="loading-spinner" *ngIf="visible && !error">
     <mat-spinner color="primary">
     </mat-spinner>
   </div>
+  <div class="error-state" *ngIf="error">
+    <div class="error-icon"><mat-icon>error_outline</mat-icon></div>
+    <div>Error occurred: {{ error.message }}</div>
+    <div>
+      <button mat-button (click)="refresh()" matTooltip="Refresh page" >
+        <mat-icon>refresh</mat-icon>
+      </button>
+      <button mat-button routerLink="/" matTooltip="Go to home" >
+        <mat-icon>home</mat-icon>
+      </button>
+    </div>
+  </div>
 </div>
 
 
diff --git a/src/app/common/progress/progress.component.scss b/src/app/common/progress/progress.component.scss
index 8bfff484..ec3a3ecf 100644
--- a/src/app/common/progress/progress.component.scss
+++ b/src/app/common/progress/progress.component.scss
@@ -10,9 +10,19 @@
     z-index: 1000;
 }
 
-.loading-spinner {
+.loading-spinner, .error-state {
   position: fixed;
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
 }
+
+.error-state div {
+  text-align: center;
+}
+
+.error-icon mat-icon {
+  font-size: 64px;
+  width: 64px;
+  height: 64px;
+}
diff --git a/src/app/common/progress/progress.component.spec.ts b/src/app/common/progress/progress.component.spec.ts
index 5780e205..f0cfc8b2 100644
--- a/src/app/common/progress/progress.component.spec.ts
+++ b/src/app/common/progress/progress.component.spec.ts
@@ -1,25 +1,45 @@
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
 
 import { ProgressComponent } from './progress.component';
-import { MatProgressSpinnerModule } from "@angular/material";
+import { MatIconModule, MatProgressSpinnerModule } from "@angular/material";
 import { ProgressService } from "./progress.service";
+import { RouterTestingModule } from "@angular/router/testing";
+import { Router } from "@angular/router";
+import { BehaviorSubject } from "rxjs/BehaviorSubject";
+
+
+class MockedRouter {
+  events: BehaviorSubject<boolean>;
+
+  constructor() {
+    this.events = new BehaviorSubject(true);
+  }
+}
+
 
 describe('ProgressComponent', () => {
   let component: ProgressComponent;
   let fixture: ComponentFixture<ProgressComponent>;
   let progressService: ProgressService;
+  let router: MockedRouter;
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
       imports: [
+        RouterTestingModule,
         MatProgressSpinnerModule,
+        MatIconModule
+      ],
+      providers: [
+        ProgressService,
+        { provide: Router, useClass: MockedRouter}
       ],
-      providers: [ ProgressService ],
       declarations: [ ProgressComponent ]
     })
     .compileComponents();
 
     progressService = TestBed.get(ProgressService);
+    router = TestBed.get(Router);
   }));
 
   beforeEach(() => {
@@ -45,4 +65,21 @@ describe('ProgressComponent', () => {
     expect(component.visible).toEqual(false);
   });
 
+  it( 'should set error state when error defined', () => {
+    const error = new Error("test");
+    progressService.setError(error);
+    expect(component.error).toEqual(error);
+  });
+
+  it( 'should clear error when changes route', () => {
+    const error = new Error("test");
+    component.error = error;
+
+    spyOn(progressService, 'clear');
+
+    router.events.next(true);
+
+    expect(progressService.clear).toHaveBeenCalled();
+  });
+
 });
diff --git a/src/app/common/progress/progress.component.ts b/src/app/common/progress/progress.component.ts
index 3a823ad2..cd4f2607 100644
--- a/src/app/common/progress/progress.component.ts
+++ b/src/app/common/progress/progress.component.ts
@@ -1,22 +1,49 @@
-import { Component, OnInit } from '@angular/core';
+import { Component, OnDestroy, OnInit } from '@angular/core';
 import { ProgressService } from "./progress.service";
+import { Router } from "@angular/router";
+import { Subscription } from "rxjs/Subscription";
 
 @Component({
   selector: 'app-progress',
   templateUrl: './progress.component.html',
   styleUrls: ['./progress.component.scss']
 })
-export class ProgressComponent implements OnInit {
+export class ProgressComponent implements OnInit, OnDestroy {
   visible = false;
+  error: Error;
+  routerSubscription: Subscription;
 
   constructor(
-    private progressService: ProgressService
+    private progressService: ProgressService,
+    private router: Router,
   ) { }
 
   ngOnInit() {
     this.progressService.state.subscribe((state) => {
       this.visible = state.visible;
+
+      // only set error state once; ignore next "correct" states
+      if (state.error && !this.error) {
+        this.error = state.error;
+      }
+
+      if (state.clear) {
+        this.error = null;
+      }
+    });
+
+    // when page changes clear error state
+    this.routerSubscription = this.router.events.subscribe(() => {
+      this.progressService.clear();
     });
   }
 
+  refresh() {
+    // unfortunately we need to use global var
+    location.reload();
+  }
+
+  ngOnDestroy() {
+    this.routerSubscription.unsubscribe();
+  }
 }
diff --git a/src/app/common/progress/progress.service.spec.ts b/src/app/common/progress/progress.service.spec.ts
index dc375e57..530216ff 100644
--- a/src/app/common/progress/progress.service.spec.ts
+++ b/src/app/common/progress/progress.service.spec.ts
@@ -1,16 +1,43 @@
 import { TestBed, inject } from '@angular/core/testing';
 
-import { ProgressService } from './progress.service';
+import { ProgressService, State } from './progress.service';
 
 
 describe('ProgressService', () => {
+  let progressService: ProgressService;
+
   beforeEach(() => {
     TestBed.configureTestingModule({
       providers: [ProgressService]
     });
+
+    progressService = TestBed.get(ProgressService);
+
+    spyOn(progressService.state, 'next');
   });
 
-  it('should be created', inject([ProgressService], (service: ProgressService) => {
-    expect(service).toBeTruthy();
-  }));
+  it('should be created', () => {
+    expect(progressService).toBeTruthy();
+  });
+
+  it('should propagate event when activated', () => {
+    progressService.activate();
+    expect(progressService.state.next).toHaveBeenCalledWith(new State(true));
+  });
+
+  it('should propagate event when deactivated', () => {
+    progressService.deactivate();
+    expect(progressService.state.next).toHaveBeenCalledWith(new State(false));
+  });
+
+  it('should propagate event on error', () => {
+    const error = new Error();
+    progressService.setError(error);
+    expect(progressService.state.next).toHaveBeenCalledWith(new State(false, error));
+  });
+
+  it('should clear an error', () => {
+    progressService.clear();
+    expect(progressService.state.next).toHaveBeenCalledWith(new State(false, null, true));
+  });
 });
diff --git a/src/app/common/progress/progress.service.ts b/src/app/common/progress/progress.service.ts
index 1ac037a0..4c68d3c0 100644
--- a/src/app/common/progress/progress.service.ts
+++ b/src/app/common/progress/progress.service.ts
@@ -5,9 +5,13 @@ import { BehaviorSubject } from "rxjs/BehaviorSubject";
 
 export class State {
   public visible: boolean;
+  public error: Error;
+  public clear: boolean;
 
-  constructor(visible: boolean) {
+  constructor(visible: boolean, error?: Error, clear: boolean = false) {
     this.visible = visible;
+    this.error = error;
+    this.clear = clear;
   }
 }
 
@@ -17,6 +21,14 @@ export class ProgressService {
 
   constructor() {}
 
+  public setError(error: Error) {
+    this.state.next(new State(false, error));
+  }
+
+  public clear() {
+    this.state.next(new State(false, null, true));
+  }
+
   public activate() {
     this.state.next(new State(true));
   }
diff --git a/src/app/components/project-map/project-map.component.html b/src/app/components/project-map/project-map.component.html
index 63962683..d679d016 100644
--- a/src/app/components/project-map/project-map.component.html
+++ b/src/app/components/project-map/project-map.component.html
@@ -62,9 +62,6 @@
   <app-node-select-interface (onChooseInterface)="onChooseInterface($event)"></app-node-select-interface>
 </div>
 
-<div class="loading-spinner" *ngIf="isLoading">
-  <mat-spinner color="primary">
-  </mat-spinner>
-</div>
+<app-progress></app-progress>
 
 <app-project-map-shortcuts *ngIf="project" [project]="project" [server]="server" [selectionManager]="selectionManager"></app-project-map-shortcuts>
diff --git a/src/app/components/project-map/project-map.component.ts b/src/app/components/project-map/project-map.component.ts
index f65b88f0..19d1537b 100644
--- a/src/app/components/project-map/project-map.component.ts
+++ b/src/app/components/project-map/project-map.component.ts
@@ -41,6 +41,7 @@ import { InRectangleHelper } from "../../cartography/components/map/helpers/in-r
 import { DrawingsDataSource } from "../../cartography/datasources/drawings-datasource";
 import { Subscription } from "rxjs/Subscription";
 import { SettingsService } from "../../services/settings.service";
+import { ProgressService } from "../../common/progress/progress.service";
 
 
 @Component({
@@ -65,8 +66,6 @@ export class ProjectMapComponent implements OnInit, OnDestroy {
 
   protected selectionManager: SelectionManager;
 
-  public isLoading = true;
-
   @ViewChild(MapComponent) mapChild: MapComponent;
 
   @ViewChild(NodeContextMenuComponent) nodeContextMenu: NodeContextMenuComponent;
@@ -84,6 +83,7 @@ export class ProjectMapComponent implements OnInit, OnDestroy {
               private linkService: LinkService,
               private dialog: MatDialog,
               private progressDialogService: ProgressDialogService,
+              private progressService: ProgressService,
               private toaster: ToasterService,
               private projectWebServiceHandler: ProjectWebServiceHandler,
               private settingsService: SettingsService,
@@ -98,6 +98,7 @@ export class ProjectMapComponent implements OnInit, OnDestroy {
   }
 
   ngOnInit() {
+    this.progressService.activate();
 
     const routeSub = this.route.paramMap.subscribe((paramMap: ParamMap) => {
       const server_id = parseInt(paramMap.get('server_id'), 10);
@@ -123,6 +124,10 @@ export class ProjectMapComponent implements OnInit, OnDestroy {
         })
         .subscribe((project: Project) => {
           this.onProjectLoad(project);
+        }, (error) => {
+          this.progressService.setError(error);
+        }, () => {
+            this.progressService.deactivate();
         });
     });
 
@@ -183,7 +188,8 @@ export class ProjectMapComponent implements OnInit, OnDestroy {
 
         this.setUpMapCallbacks(project);
         this.setUpWS(project);
-        this.isLoading = false;
+
+        this.progressService.deactivate();
       });
     this.subscriptions.push(subscription);
   }
@@ -335,7 +341,9 @@ export class ProjectMapComponent implements OnInit, OnDestroy {
     this.nodesDataSource.clear();
     this.linksDataSource.clear();
 
-    this.ws.unsubscribe();
+    if (this.ws) {
+      this.ws.unsubscribe();
+    }
     this.subscriptions.forEach((subscription: Subscription) => subscription.unsubscribe());
   }
 
diff --git a/src/app/components/projects/projects.component.ts b/src/app/components/projects/projects.component.ts
index 47c327c7..bb5d6a95 100644
--- a/src/app/components/projects/projects.component.ts
+++ b/src/app/components/projects/projects.component.ts
@@ -62,6 +62,8 @@ export class ProjectsComponent implements OnInit {
       .list(this.server)
       .subscribe((projects: Project[]) => {
         this.projectDatabase.addProjects(projects);
+      }, (error) => {
+        this.progressService.setError(error);
       });
   }
 
diff --git a/src/app/raven-error-handler.ts b/src/app/raven-error-handler.ts
deleted file mode 100644
index c3288588..00000000
--- a/src/app/raven-error-handler.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-import * as Raven from 'raven-js';
-
-import { ErrorHandler, Inject, Injector } from "@angular/core";
-
-import { SettingsService } from "./services/settings.service";
-import { environment } from "../environments/environment";
-
-
-export class RavenErrorHandler implements ErrorHandler {
-  constructor(@Inject(Injector) protected injector: Injector) {}
-
-  handleError(err: any): void {
-    Raven.setShouldSendCallback(this.shouldSend());
-
-    console.error(err.originalError || err);
-  }
-
-  shouldSend() {
-    return () => {
-      const settingsService: SettingsService = this.injector.get(SettingsService);
-      return environment.production && settingsService.get('crash_reports');
-    };
-  }
-}
diff --git a/src/app/services/appliance.service.spec.ts b/src/app/services/appliance.service.spec.ts
index 33678df6..0f749331 100644
--- a/src/app/services/appliance.service.spec.ts
+++ b/src/app/services/appliance.service.spec.ts
@@ -5,6 +5,7 @@ import { HttpClient } from "@angular/common/http";
 import { ApplianceService } from './appliance.service';
 import { Server } from '../models/server';
 import { HttpServer } from './http-server.service';
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 
 
@@ -16,7 +17,8 @@ describe('ApplianceService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         ApplianceService,
diff --git a/src/app/services/http-server.service.spec.ts b/src/app/services/http-server.service.spec.ts
index 0034dd70..5ff73d16 100644
--- a/src/app/services/http-server.service.spec.ts
+++ b/src/app/services/http-server.service.spec.ts
@@ -5,6 +5,7 @@ import { HttpClient } from "@angular/common/http";
 import { Server } from '../models/server';
 import { HttpServer } from './http-server.service';
 import { getTestServer } from './testing';
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 class MyType {
   id: number;
@@ -20,7 +21,8 @@ describe('HttpServer', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         HttpServer
diff --git a/src/app/services/http-server.service.ts b/src/app/services/http-server.service.ts
index 56a22919..2325d1a4 100644
--- a/src/app/services/http-server.service.ts
+++ b/src/app/services/http-server.service.ts
@@ -1,8 +1,11 @@
 import { Injectable } from '@angular/core';
-import {HttpHeaders, HttpClient, HttpParams} from '@angular/common/http';
+import { HttpHeaders, HttpClient, HttpParams, HttpErrorResponse } from '@angular/common/http';
 import { Observable } from 'rxjs/Observable';
 
 import {Server} from "../models/server";
+import { catchError } from "rxjs/operators";
+
+import 'rxjs/add/observable/throw'
 
 
 /* tslint:disable:interface-over-type-literal */
@@ -40,57 +43,104 @@ export type HeadersOptions = {
 /* tslint:enable:interface-over-type-literal */
 
 
+export class ServerError extends Error {
+  public originalError: Error;
+
+  constructor(message: string) {
+    super(message);
+  }
+
+  static fromError(message: string, originalError: Error) {
+    const serverError = new ServerError(message);
+    serverError.originalError = originalError;
+    return serverError;
+  }
+}
+
+@Injectable()
+export class ServerErrorHandler {
+  handleError(error: HttpErrorResponse) {
+    let err: Error = error;
+
+    if (error.name === 'HttpErrorResponse' && error.status === 0) {
+      err = ServerError.fromError("Server is unreachable", error);
+    }
+
+    return Observable.throw(err);
+  }
+}
+
+
 @Injectable()
 export class HttpServer {
 
-  constructor(private http: HttpClient) { }
+  constructor(
+    private http: HttpClient,
+    private errorHandler: ServerErrorHandler
+  ) { }
 
   get<T>(server: Server, url: string, options?: JsonOptions): Observable<T> {
     options = this.getJsonOptions(options);
     const intercepted = this.getOptionsForServer<JsonOptions>(server, url, options);
-    return this.http.get<T>(intercepted.url, intercepted.options as JsonOptions);
+    return this.http
+      .get<T>(intercepted.url, intercepted.options as JsonOptions)
+      .pipe(catchError<T, any>(this.errorHandler.handleError));
   }
 
   getText(server: Server, url: string, options?: TextOptions): Observable<string> {
     options = this.getTextOptions(options);
     const intercepted = this.getOptionsForServer<TextOptions>(server, url, options);
-    return this.http.get(intercepted.url, intercepted.options as TextOptions);
+    return this.http
+      .get(intercepted.url, intercepted.options as TextOptions)
+      .pipe(catchError(this.errorHandler.handleError));
   }
 
   post<T>(server: Server, url: string, body: any | null, options?: JsonOptions): Observable<T> {
     options = this.getJsonOptions(options);
     const intercepted = this.getOptionsForServer(server, url, options);
-    return this.http.post<T>(intercepted.url, body, intercepted.options);
+    return this.http
+      .post<T>(intercepted.url, body, intercepted.options)
+      .pipe(catchError<T, any>(this.errorHandler.handleError));
   }
 
   put<T>(server: Server, url: string, body: any, options?: JsonOptions): Observable<T> {
     options = this.getJsonOptions(options);
     const intercepted = this.getOptionsForServer(server, url, options);
-    return this.http.put<T>(intercepted.url, body, intercepted.options);
+    return this.http
+      .put<T>(intercepted.url, body, intercepted.options)
+      .pipe(catchError<T, any>(this.errorHandler.handleError));
   }
 
   delete<T>(server: Server, url: string, options?: JsonOptions): Observable<T> {
     options = this.getJsonOptions(options);
     const intercepted = this.getOptionsForServer(server, url, options);
-    return this.http.delete<T>(intercepted.url, intercepted.options);
+    return this.http
+      .delete<T>(intercepted.url, intercepted.options)
+      .pipe(catchError<T, any>(this.errorHandler.handleError));
   }
 
   patch<T>(server: Server, url: string, body: any, options?: JsonOptions): Observable<T> {
     options = this.getJsonOptions(options);
     const intercepted = this.getOptionsForServer(server, url, options);
-    return this.http.patch<T>(intercepted.url, body, intercepted.options);
+    return this.http
+      .patch<T>(intercepted.url, body, intercepted.options)
+      .pipe(catchError<T, any>(this.errorHandler.handleError));
   }
 
   head<T>(server: Server, url: string, options?: JsonOptions): Observable<T> {
     options = this.getJsonOptions(options);
     const intercepted = this.getOptionsForServer(server, url, options);
-    return this.http.head<T>(intercepted.url, intercepted.options);
+    return this.http
+      .head<T>(intercepted.url, intercepted.options)
+      .pipe(catchError<T, any>(this.errorHandler.handleError));
   }
 
   options<T>(server: Server, url: string, options?: JsonOptions): Observable<T> {
     options = this.getJsonOptions(options);
     const intercepted = this.getOptionsForServer(server, url, options);
-    return this.http.options<T>(intercepted.url, intercepted.options);
+    return this.http
+      .options<T>(intercepted.url, intercepted.options)
+      .pipe(catchError<T, any>(this.errorHandler.handleError));
   }
 
   private getJsonOptions(options: JsonOptions): JsonOptions {
diff --git a/src/app/services/link.service.spec.ts b/src/app/services/link.service.spec.ts
index 9d529345..0e3c1e8f 100644
--- a/src/app/services/link.service.spec.ts
+++ b/src/app/services/link.service.spec.ts
@@ -8,6 +8,7 @@ import { Server } from '../models/server';
 import { Node } from '../cartography/models/node';
 import { Port } from '../models/port';
 import { getTestServer } from './testing';
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 describe('LinkService', () => {
   let httpClient: HttpClient;
@@ -19,7 +20,8 @@ describe('LinkService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         HttpServer,
diff --git a/src/app/services/node.service.spec.ts b/src/app/services/node.service.spec.ts
index 43fe5b37..565efe5b 100644
--- a/src/app/services/node.service.spec.ts
+++ b/src/app/services/node.service.spec.ts
@@ -5,11 +5,11 @@ import { HttpTestingController, HttpClientTestingModule } from '@angular/common/
 import { HttpServer } from './http-server.service';
 import { Server } from '../models/server';
 import { Node } from '../cartography/models/node';
-import { Port } from '../models/port';
 import { getTestServer } from './testing';
 import { NodeService } from './node.service';
 import { Appliance } from '../models/appliance';
 import { Project } from '../models/project';
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 describe('NodeService', () => {
   let httpClient: HttpClient;
@@ -21,7 +21,8 @@ describe('NodeService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         HttpServer,
diff --git a/src/app/services/project.service.spec.ts b/src/app/services/project.service.spec.ts
index 9dc0d652..ee38db72 100644
--- a/src/app/services/project.service.spec.ts
+++ b/src/app/services/project.service.spec.ts
@@ -10,6 +10,7 @@ import { SettingsService } from "./settings.service";
 import { MockedSettingsService } from "./settings.service.spec";
 import { Observable } from "rxjs/Observable";
 import { Project } from "../models/project";
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 
 /**
@@ -47,7 +48,8 @@ describe('ProjectService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         HttpServer,
diff --git a/src/app/services/snapshot.service.spec.ts b/src/app/services/snapshot.service.spec.ts
index 52f63ee7..32b09144 100644
--- a/src/app/services/snapshot.service.spec.ts
+++ b/src/app/services/snapshot.service.spec.ts
@@ -4,11 +4,10 @@ import { HttpClient } from '@angular/common/http';
 import { HttpTestingController, HttpClientTestingModule } from '@angular/common/http/testing';
 import { HttpServer } from './http-server.service';
 import { Server } from '../models/server';
-import { Node } from '../cartography/models/node';
-import { Port } from '../models/port';
 import { getTestServer } from './testing';
 import { SnapshotService } from './snapshot.service';
 import { Snapshot } from '../models/snapshot';
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 
 describe('SnapshotService', () => {
@@ -21,7 +20,8 @@ describe('SnapshotService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         HttpServer,
diff --git a/src/app/services/symbol.service.spec.ts b/src/app/services/symbol.service.spec.ts
index ef815626..a77bf3bb 100644
--- a/src/app/services/symbol.service.spec.ts
+++ b/src/app/services/symbol.service.spec.ts
@@ -7,6 +7,7 @@ import { Server } from '../models/server';
 import { getTestServer } from './testing';
 import { SymbolService } from './symbol.service';
 import { Symbol } from '../cartography/models/symbol';
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 
 describe('SymbolService', () => {
@@ -19,7 +20,8 @@ describe('SymbolService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         HttpServer,
diff --git a/src/app/services/version.service.spec.ts b/src/app/services/version.service.spec.ts
index b3ca1ca2..50799f7c 100644
--- a/src/app/services/version.service.spec.ts
+++ b/src/app/services/version.service.spec.ts
@@ -8,6 +8,7 @@ import { Node } from '../cartography/models/node';
 import { Port } from '../models/port';
 import { getTestServer } from './testing';
 import { VersionService } from './version.service';
+import { AppTestingModule } from "../testing/app-testing/app-testing.module";
 
 
 describe('VersionService', () => {
@@ -20,7 +21,8 @@ describe('VersionService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [
-        HttpClientTestingModule
+        HttpClientTestingModule,
+        AppTestingModule
       ],
       providers: [
         HttpServer,
diff --git a/src/app/testing/app-testing/app-testing.module.ts b/src/app/testing/app-testing/app-testing.module.ts
new file mode 100644
index 00000000..d6691651
--- /dev/null
+++ b/src/app/testing/app-testing/app-testing.module.ts
@@ -0,0 +1,14 @@
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { ServerErrorHandler } from "../../services/http-server.service";
+
+@NgModule({
+  imports: [
+    CommonModule
+  ],
+  declarations: [],
+  providers: [
+    ServerErrorHandler
+  ]
+})
+export class AppTestingModule { }
diff --git a/yarn.lock b/yarn.lock
index 3099cca0..884b7bb4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6526,8 +6526,8 @@ range-parser@^1.0.3, range-parser@^1.2.0, range-parser@~1.2.0:
   resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.0.tgz#f49be6b487894ddc40dcc94a322f611092e00d5e"
 
 raven-js@^3.24.1:
-  version "3.25.1"
-  resolved "https://registry.yarnpkg.com/raven-js/-/raven-js-3.25.1.tgz#05df39b41af140e3b2fa34e2c522e2b4f99a98be"
+  version "3.26.3"
+  resolved "https://registry.yarnpkg.com/raven-js/-/raven-js-3.26.3.tgz#0efb49969b5b11ab965f7b0d6da4ca102b763cb0"
 
 raven@^2.6.0:
   version "2.6.1"