hwahrmann has the problem that the server always crashes when the UPnP SSDP controller tries starting receiving from an endpoint which is.. disconnected? Otherwise not available? He says it is always related to IPv6 addresses.

h4. Steps to Reproduce
      2009-11-16 10:21:21.066157 [Info.][Main Thread]: UPnP server: HTTP listener started at port 49247
      A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
      2009-11-16 10:21:21.097356 [Crit.][Main Thread]: Error executing application
      Exception: System.Net.Sockets.SocketException: The system detected an invalid pointer address in attempting to use a pointer argument in a call
         at System.Net.Sockets.Socket.DoBeginReceiveFrom(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, EndPoint endPointSnapshot, SocketAddress socketAddress, OverlappedAsyncResult asyncResult)
         at System.Net.Sockets.Socket.BeginReceiveFrom(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, EndPoint& remoteEP, AsyncCallback callback, Object state)
         at UPnP.Infrastructure.Dv.SSDP.SSDPServerController.StartReceive(UDPAsyncReceiveState state) in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\SSDP\SSDPServerController.cs:line 353
         at UPnP.Infrastructure.Dv.SSDP.SSDPServerController.StartSSDPEndpoint(EndpointConfiguration config) in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\SSDP\SSDPServerController.cs:line 299
         at UPnP.Infrastructure.Dv.UPnPServer.InitializeDiscoveryEndpoints() in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\UPnPServer.cs:line 415
         at UPnP.Infrastructure.Dv.UPnPServer.Bind(Int32 advertisementInterval) in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\UPnPServer.cs:line 192
         at MediaPortal.ClientCommunication.UPnPMediaServer.Start() in D:\Source\Mp\MP-II\Source\System\MediaPortal.Backend\ClientCommunication\UPnPMediaServer.cs:line 61
         at MediaPortal.Services.BackendServer.BackendServer.Startup() in D:\Source\Mp\MP-II\Source\System\MediaPortal.Backend\Services\BackendServer\BackendServer.cs:line 156
         at MediaPortal.BackendExtension.StartupBackendServices() in D:\Source\Mp\MP-II\Source\System\MediaPortal.Backend\BackendExtension.cs:line 57
         at MediaPortal.ApplicationLauncher.Main(String[] args) in D:\Source\Mp\MP-II\Source\Main\MediaPortal.Server\ApplicationLauncher.cs:line 118
        Message: The system detected an invalid pointer address in attempting to use a pointer argument in a call
        Site : Void DoBeginReceiveFrom(Byte[], Int32, Int32, System.Net.Sockets.SocketFlags, System.Net.EndPoint, System.Net.SocketAddress, System.Net.Sockets.OverlappedAsyncResult)
        Source : System
      Stack Trace:
         at System.Net.Sockets.Socket.DoBeginReceiveFrom(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, EndPoint endPointSnapshot, SocketAddress socketAddress, OverlappedAsyncResult asyncResult)
         at System.Net.Sockets.Socket.BeginReceiveFrom(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, EndPoint& remoteEP, AsyncCallback callback, Object state)
         at UPnP.Infrastructure.Dv.SSDP.SSDPServerController.StartReceive(UDPAsyncReceiveState state) in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\SSDP\SSDPServerController.cs:line 353
         at UPnP.Infrastructure.Dv.SSDP.SSDPServerController.StartSSDPEndpoint(EndpointConfiguration config) in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\SSDP\SSDPServerController.cs:line 299
         at UPnP.Infrastructure.Dv.UPnPServer.InitializeDiscoveryEndpoints() in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\UPnPServer.cs:line 415
         at UPnP.Infrastructure.Dv.UPnPServer.Bind(Int32 advertisementInterval) in D:\Source\Mp\MP-II\Source\System\UPnP\Infrastructure\Dv\UPnPServer.cs:line 192
         at MediaPortal.ClientCommunication.UPnPMediaServer.Start() in D:\Source\Mp\MP-II\Source\System\MediaPortal.Backend\ClientCommunication\UPnPMediaServer.cs:line 61
         at MediaPortal.Services.BackendServer.BackendServer.Startup() in D:\Source\Mp\MP-II\Source\System\MediaPortal.Backend\Services\BackendServer\BackendServer.cs:line 156
         at MediaPortal.BackendExtension.StartupBackendServices() in D:\Source\Mp\MP-II\Source\System\MediaPortal.Backend\BackendExtension.cs:line 57
         at MediaPortal.ApplicationLauncher.Main(String[] args) in D:\Source\Mp\MP-II\Source\Main\MediaPortal.Server\ApplicationLauncher.cs:line 118

h4. Additional Information
At startup, we should check which ones of the IP addresses don't work in for Bind or Receive, and remove them from the collection of available endpoints.