Additional note: there are several filters that I have been unable to get to
work. For example, I have enabled both 8080 (for outgoing access to remote
routers) & 8081 (incoming access to Symantec Mail Security), but cannot get
through either one.
Default you don't have to enable outgoing packets, certainly not for port
8080. Rerun ICW, enable the Firewall and change something, so it will put
back ISA to its defaults.
Then see how it goes.