diff --git a/gns3server/modules/dynamips/__init__.py b/gns3server/modules/dynamips/__init__.py
index 2477a0b6..c10fce52 100644
--- a/gns3server/modules/dynamips/__init__.py
+++ b/gns3server/modules/dynamips/__init__.py
@@ -160,8 +160,6 @@ class Dynamips(BaseManager):
         files += glob.glob(os.path.join(project_dir, "ilt_*"))
         files += glob.glob(os.path.join(project_dir, "c[0-9][0-9][0-9][0-9]_*_rommon_vars"))
         files += glob.glob(os.path.join(project_dir, "c[0-9][0-9][0-9][0-9]_*_ssa"))
-        files += glob.glob(os.path.join(project_dir, "dynamips_log*"))
-        files += glob.glob(os.path.join(project_dir, "*_log.txt"))
         for file in files:
             try:
                 log.debug("Deleting file {}".format(file))
diff --git a/gns3server/modules/dynamips/hypervisor.py b/gns3server/modules/dynamips/hypervisor.py
index 778c490b..5d1867d0 100644
--- a/gns3server/modules/dynamips/hypervisor.py
+++ b/gns3server/modules/dynamips/hypervisor.py
@@ -42,7 +42,7 @@ class Hypervisor(DynamipsHypervisor):
     :param host: host/address for this hypervisor
     """
 
-    _instance_count = 0
+    _instance_count = 1
 
     def __init__(self, path, working_dir, host, port):
 
@@ -181,7 +181,7 @@ class Hypervisor(DynamipsHypervisor):
 
         command = [self._path]
         command.extend(["-N1"])  # use instance IDs for filenames
-        command.extend(["-l", "dynamips_log_{}.txt".format(self._port)])  # log file
+        command.extend(["-l", "dynamips_i{}_log.txt".format(self._id)])  # log file
         if self._host != "0.0.0.0" and self._host != "::":
             command.extend(["-H", "{}:{}".format(self._host, self._port)])
         else:
diff --git a/gns3server/modules/dynamips/nodes/router.py b/gns3server/modules/dynamips/nodes/router.py
index 456d4bdf..910430a9 100644
--- a/gns3server/modules/dynamips/nodes/router.py
+++ b/gns3server/modules/dynamips/nodes/router.py
@@ -1494,7 +1494,8 @@ class Router(BaseVM):
         """
 
         try:
-            reply = yield from self._hypervisor.send("vm extract_config {}".format(self._name))[0].rsplit(' ', 2)[-2:]
+            reply = yield from self._hypervisor.send("vm extract_config {}".format(self._name))
+            reply = reply[0].rsplit(' ', 2)[-2:]
         except IOError:
             #for some reason Dynamips gets frozen when it does not find the magic number in the NVRAM file.
             return None, None