I pushed an update today trying to address that pesky "Couldn't replace wsock32.dll" error. When I packaged the update I mistakenly slipped in a broken cncnet.dll that was auto-updated to everyone. Naturally no one could not connect anymore.
Got it fixed pretty quickly after discovering. Sorry for the interruption. It will auto-update hopefully when you run cncnet.exe again. If it doesn't, redownload the client from our site.
Working towards CnCNet 4.0, new fancy things are coming this year!