> Our Classic Server stopped working overnight and we had to switch to
> Super Server to get it to work. Switching back to Classic Server
> brought up the same problems.

...

> * No Microsoft updates. No event log errors. We shut down the virus
> program, but that made no difference.

May be *anti* virus ? ;) Antivirus SF often modified winsock library to
prevent some kind of attacks. For example ESET's NOD32 is not enough
to stop to allow CS to work. Instead you must add fb_inet_server into
IMON's exclusion list.

Regards,
Vlad