Catch the "WinError 0 The operation completed successfully" exception at a higher level.

gns3server/main.py

@@ -181,6 +181,10 @@ def main():
     server = Server.instance(host, port)
     try:
         server.run()
+    except OSError as e:
+        # This is to ignore OSError: [WinError 0] The operation completed successfully exception on Windows.
+        if not sys.platform.startswith("win") and not e.winerror == 0:
+            raise
     except Exception as e:
         log.critical("Critical error while running the server: {}".format(e), exc_info=1)
         CrashReport.instance().capture_exception()

gns3server/server.py

@@ -225,11 +225,6 @@ class Server:
 
         try:
             self._loop.run_forever()
-        except OSError as e:
-            # This is to ignore OSError: [WinError 0] The operation completed successfully
-            # exception on Windows.
-            if not sys.platform.startswith("win") and not e.winerror == 0:
-                raise
         except TypeError as e:
             # This is to ignore an asyncio.windows_events exception
             # on Windows when the process gets the SIGBREAK signal