Maybe this will help you (it's a part of MSAS Help):
"Using the SpyNet AntiSpyware Community with a Firewall
All the features of the SpyNet AntiSpyware Community as well as Microsoft
AntiSpyware's AutoUpdate are compatible with all software and hardware
firewalls on the market today. Both the SpyNet AntiSpyware Community and the
AutoUpdater use the standard HTTP port 80 to communicate with the remote
servers and the client (Microsoft AntiSpyware) software.
If you are running a software firewall
If your computer is running a software based firewall, you will need to make
sure that port 80 is open. By default port 80 should already be open to
allow for standard HTTP Web-based traffic to flow. In addition some
software-based firewalls restrict access to various programs that connect to
the Internet. If this is the case you will want to make sure that the
following Microsoft AntiSpyware files have permission to access the Internet
over port 80:
1. MicrosoftAntiSpywareMain.exe (the primary Microsoft AntiSpyware
application)
2. gcasDtServ.exe (provides access to SpyNet for reporting unknown
applications)
3. MicrosoftAntiSpywareUpdater.exe (provides functionality to update the
latest spyware definitions)
4. gcasServAlert.exe (provides access to SpyNet for reporting unknown
applications)
If you are running Windows XP Firewall Service Pack 2
If you are running Windows XP with Service Pack 2 and have the Internet
Firewall enabled with application protection you will want to make sure that
the following Microsoft AntiSpyware applications have permission to access
the Internet:
1. MicrosoftAntiSpywareMain.exe (the primary Microsoft AntiSpyware
application)
2. gcasDtServ.exe (provides access to SpyNet for reporting unknown
applications)
3. MicrosoftAntiSpywareUpdater.exe (provides functionality to update the
latest spyware definitions)
4. gcasServAlert.exe (provides access to SpyNet for reporting unknown
applications)
If you are running a hardware firewall
If your computer is behind a hardware firewall, such as a router or a
wireless base station with an active firewall, all you will need to do is
make sure that port 80 is open. By default port 80 should already be open to
allow for standard HTTP Web-based traffic to flow. Without port 80 open to
most connections you would not be able to browse the Web."
Kind regards
Mikolaj
