ISA Firewall Client 2004 and VB6 Winsock problems

Hi everyone - First time posting on this forum. I'm hoping you can help.

I have a vb6 program which uses winsock to communicate back to a server application.

It works great except when MS ISA Firewall Client 2004 is installed.

Basically, the program will not shut down if a connection is established. All forms will unload correctly, and all of my unload events fire just fine - but the program stays in memory until killed with the task manager.

Any suggestions?

Thanks in advance!