Previous 5.04 releases had an exception handler missing from connectTo that results in a socket leaking if socketToHandle fails for some reason (I cant remember the exact circumstances at the moment, but it causes a server to die - I think the leak is caused when the client closes the connection during the handshake - ie somebody presses stop on a web browser because of a slow connection after the handshake has just started) - I suggested a fix along the lines of: connectTo hostname (Service serv) = do proto <- getProtocolNumber "tcp" port <- getServicePortNumber serv he <- getHostByName hostname sock <- socket AF_INET Stream proto (do connect sock (SockAddrInet port (hostAddress he)) socketToHandle sock ReadWriteMode) `Control.Exception.catch` (\e -> do sClose sock; throw e) This seems to be missing from 5.04.3 - this fix is important for reliability in a production server, what happened - does this cause problems in other places? Regards, Keean Schupke.