Hello,
I'd need more information to understand what your problem is:
- is your ISA placed upstream or downstream of SWG? ISA server should be placed upstream, otherwise SWG will see all the internal traffic coming from the ISA server IP address.
- Did you add ISA into the Administration > Configuration > Server page as "proxy"?
- Did you enable the option " Analyze ports used by proxy" under Administration > Configuration > Proxy?
-Can you eventually provide more details about your deployment?
Also, this technote is worth reading as a checklist for new deployments:
Symantec Web Gateway (SWG) - Best Practices: New Deployments
http://www.symantec.com/docs/TECH144596
Thanks,
Federico