I recently been playing MGS4 online with no problems, but recently I have started getting this disconnection error with the code 051C:00000000... not that it means much I think.

I have no idea why it has been disconnecting randomly, it's a common occurrence, is it 'port' related? If so I'm not quite sure what ports to use? do I have to have upnp enabled/disabled etc. pretty sure its enable though.

Thanks once again guys,
Appreciate any help,
British Command