diff --git a/gns3server/modules/dynamips/__init__.py b/gns3server/modules/dynamips/__init__.py
index f27fd896..ddc18dbe 100644
--- a/gns3server/modules/dynamips/__init__.py
+++ b/gns3server/modules/dynamips/__init__.py
@@ -419,7 +419,7 @@ class Dynamips(IModule):
             ghost.ram = router.ram
             ghost.start()
             ghost.stop()
-            ghost.delete()
+            ghost.clean_delete()
 
         if router.ghost_file != ghost_instance:
             # set the ghost file to the router
diff --git a/gns3server/modules/dynamips/backends/vm.py b/gns3server/modules/dynamips/backends/vm.py
index 14930f2b..9059fd20 100644
--- a/gns3server/modules/dynamips/backends/vm.py
+++ b/gns3server/modules/dynamips/backends/vm.py
@@ -226,7 +226,7 @@ class VM(object):
             return
 
         try:
-            router.delete()
+            router.clean_delete()
             self._hypervisor_manager.unallocate_hypervisor_for_router(router)
             del self._routers[router_id]
         except DynamipsError as e:
diff --git a/gns3server/modules/dynamips/nodes/router.py b/gns3server/modules/dynamips/nodes/router.py
index a64286e5..a2328294 100644
--- a/gns3server/modules/dynamips/nodes/router.py
+++ b/gns3server/modules/dynamips/nodes/router.py
@@ -280,7 +280,7 @@ class Router(object):
         Deletes this router.
         """
 
-        self._hypervisor.send("vm clean_delete {}".format(self._name))
+        self._hypervisor.send("vm delete {}".format(self._name))
         self._hypervisor.devices.remove(self)
 
         log.info("router {name} [id={id}] has been deleted".format(name=self._name, id=self._id))
@@ -290,6 +290,21 @@ class Router(object):
         if self.aux:
             self._allocated_aux_ports.remove(self.aux)
 
+    def clean_delete(self):
+        """
+        Deletes this router & associated files (nvram, disks etc.)
+        """
+
+        self._hypervisor.send("vm clean_delete {}".format(self._name))
+        self._hypervisor.devices.remove(self)
+
+        log.info("router {name} [id={id}] has been deleted (including associated files)".format(name=self._name, id=self._id))
+        self._allocated_names.remove(self.name)
+        if self.console:
+            self._allocated_console_ports.remove(self.console)
+        if self.aux:
+            self._allocated_aux_ports.remove(self.aux)
+
     def start(self):
         """
         Starts this router.
diff --git a/gns3server/modules/iou/schemas.py b/gns3server/modules/iou/schemas.py
index 62ac0ec4..62b35747 100644
--- a/gns3server/modules/iou/schemas.py
+++ b/gns3server/modules/iou/schemas.py
@@ -313,13 +313,6 @@ IOU_ADD_NIO_SCHEMA = {
             "minimum": 0,
             "maximum": 3
         },
-
-        "slot": {
-            "description": "Slot number",
-            "type": "integer",
-            "minimum": 0,
-            "maximum": 15
-        },
         "nio": {
             "type": "object",
             "description": "Network Input/Output",
diff --git a/gns3server/version.py b/gns3server/version.py
index 3d651704..dca48fbb 100644
--- a/gns3server/version.py
+++ b/gns3server/version.py
@@ -23,5 +23,5 @@
 # or negative for a release candidate or beta (after the base version
 # number has been incremented)
 
-__version__ = "1.0-alpha3"
+__version__ = "1.0a4.dev1"
 __version_info__ = (1, 0, 0, -99)
diff --git a/tests/conftest.py b/tests/conftest.py
index 05ac262c..a7ca89ef 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -14,6 +14,6 @@ def server(request):
     cwd = os.path.dirname(os.path.abspath(__file__))
     server_script = os.path.join(cwd, "../gns3server/main.py")
     process = subprocess.Popen([sys.executable, server_script, "--port=8000"])
-    time.sleep(0.1)  # give some time for the process to start
+    time.sleep(1)  # give some time for the process to start
     request.addfinalizer(process.terminate)
     return process