How are you supposed to detect a socket close with CSocket? There''s an OnClose method, but it never gets called when I override it... Server Socket, accepts incoming connection from the Client Socket, and sets up a Receive Socket. When the client socket closes, how does the receive socket know?

Did you register for FD_CLOSE notification like a good little winsock programmer? =)

Do I need to do that with MFC ie CSocket?

You shouldn''t need to register the FD_CLOSE event manually, the framework should handle it. It''s probable that the OnClose handler you created is attached to the listening socket rather than the socket descripter created by the call to Accept.

I''m not sure what I did, but it works now...

maybe i had the breakpoint on the wrong OnClose... I code so much better after sleep...