iwp quits on me

Newbie to firewalls and such (so be kind). I have FMSA 8.5 on a dedicated server running Windows Server 2003. We have an IT guy who set the whole thing up. There is a dedicated domain name and the firewall was configured to allow incoming traffic (I have no idea which port etc but can find out if needed). On the office "intranet", all is well. No connection is ever lost and all clients are without complaint. IWP also works, however:

I can access the database over the web most of the time. 1 time I logged off properly and then tried to log back on..."address could not be found". I tried multiple computers and was unable to access the logon page of iwp. In the office, the intranet wourked fine and I could access the server remotely. FM said that the file was "normal" and it ran fine in the office. I had to hard reset the server to get iwp to work again. The second time, I was navigating through the DB on the web and one of the pages failed to completely load. From this point onward, I could no longer log onto iwp.

Interestingly, in the "clients" section of the FMSA console, it still has me listed as being logged on remotely although no files are listed. I turn off the database and it still lists the machine where the program hung as a client.

Help!

Rick