IMMEDIATELY after Service Pack 2 is applied The Windows Firewall is enabled by DEFAULT
The firewall closes ports.
To check the Windows Firewall Settings...
Start>Control Panel>Windows Firewall->
to open Windows Firewall dialog
select the General tab
If firewall is set to ON
select the Exceptions tab
this displays list of ports that have been opened (if any)
To turn firewall OFF
change selection to OFF