Merge pull request jellyfin#6131 from BaronGreenback/Fix_NetworkFlooding

Fix network flooding issue

(cherry picked from commit b060d9d)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

Emby.Server.Implementations/EntryPoints/ExternalPortForwarding.cs

@@ -106,8 +106,6 @@ private void Start()
             NatUtility.StartDiscovery();
 
             _timer = new Timer((_) => _createdRules.Clear(), null, TimeSpan.FromMinutes(10), TimeSpan.FromMinutes(10));
-
-            _deviceDiscovery.DeviceDiscovered += OnDeviceDiscoveryDeviceDiscovered;
         }
 
         private void Stop()
@@ -118,13 +116,6 @@ private void Stop()
             NatUtility.DeviceFound -= OnNatUtilityDeviceFound;
 
             _timer?.Dispose();
-
-            _deviceDiscovery.DeviceDiscovered -= OnDeviceDiscoveryDeviceDiscovered;
-        }
-
-        private void OnDeviceDiscoveryDeviceDiscovered(object sender, GenericEventArgs<UpnpDeviceInfo> e)
-        {
-            NatUtility.Search(e.Argument.LocalIpAddress, NatProtocol.Upnp);
         }
 
         private async void OnNatUtilityDeviceFound(object sender, DeviceEventArgs e)