I have one problem in ISA server 2006, Internet is working for all users but we are getting error message form some sites we are not able to open it.
Network Access Message: The page cannot be displayed
Technical Information (for Support personnel) Error Code: 504 Proxy Timeout. The connection timed out. (10060)
and i got error message in isa alert :Client authentication time exceeded 5 seconds. This occurred 20 times during the past 5 minutes. To configure this setting, see the Microsoft Knowledge Base article 952082.