I have just installed a new hardware firewall for my clients network. It used to rely on ISA server but the firewall of that is disabled.
The firewall is a Allied Telesyn router/firewall. We set up a port on the firewall but now one of the client PC's (the MD's) messenger wont work. Ive tried quite a few different things but to no avail. Reinstalling messenger, opening the port on the firewall, talking him out of using it but he wont have any of it.
The server o/s is SBS2000. The comms is on ADSL. Im sure it cant be a major issue.