Once i add Filter (HTTP URL contains "yahoo") in WWW Proxy Server, then it cause msn messenger not able to use.
We allow users go to check yahoo mail only and they also allow to use msn messenger.
My initial plan is
1) Java Authentication -> Users can access website only and received pop mail, but they are not allow for msn or yahoo messenger.
2) WGIC -> Users are allow them to use to msn messenger. To control users which internet applications are allowed.
3) Assumed Users-> Full Access