diff --git a/gns3server/controller/compute.py b/gns3server/controller/compute.py
index 33dac0ab..5be1d6d8 100644
--- a/gns3server/controller/compute.py
+++ b/gns3server/controller/compute.py
@@ -347,7 +347,7 @@ class Compute:
         if not self._connected and not self._closed:
             try:
                 response = yield from self._run_http_query("GET", "/capabilities")
-            except (aiohttp.errors.ClientOSError, aiohttp.errors.ClientRequestError):
+            except (aiohttp.errors.ClientOSError, aiohttp.errors.ClientRequestError, aiohttp.ClientResponseError):
                 # Try to reconnect after 2 seconds if server unavailable
                 asyncio.get_event_loop().call_later(2, lambda: asyncio.async(self.connect()))
                 return
diff --git a/gns3server/controller/node.py b/gns3server/controller/node.py
index 8f797526..baa68c06 100644
--- a/gns3server/controller/node.py
+++ b/gns3server/controller/node.py
@@ -342,7 +342,7 @@ class Node:
         try:
             yield from self.post("/stop")
         # We don't care if a compute is down at this step
-        except aiohttp.errors.ClientOSError:
+        except (aiohttp.errors.ClientOSError, aiohttp.web.HTTPNotFound, aiohttp.web.HTTPConflict):
             pass
 
     @asyncio.coroutine
diff --git a/gns3server/controller/project.py b/gns3server/controller/project.py
index d1ce7e34..90130283 100644
--- a/gns3server/controller/project.py
+++ b/gns3server/controller/project.py
@@ -497,7 +497,7 @@ class Project:
             try:
                 yield from compute.post("/projects/{}/close".format(self._id))
             # We don't care if a compute is down at this step
-            except aiohttp.errors.ClientOSError:
+            except (aiohttp.errors.ClientOSError, aiohttp.web.HTTPNotFound, aiohttp.web.HTTPConflict):
                 pass
         self._cleanPictures()
         self._status = "closed"