Dear Squid Support Team, I'm running squid2.6 stable6 on CentOS 5.3 linux server. I use "max_user_ip" directive to confirm "1 username could only access with 1 IP address in a period 900 seconds" Every web accesses are OK. But Google Talk program is breaking the rule. User A : Start signin google talk and keep it login for a long period ( Example : signin 08:00 and signout 12:00 ) User B : After 900 seconds pass, use the username of "User A" signin google talk and it's success. Every 900-seconds periods, squid can't hold the session of google talk. Checking on access.log Log occur only when "Sign In" and "Sign Out" actions. While it login no more log. Could it solve by squid configuration (squid.conf) ? Or, Are there have a solutions on this? Thank you. Thirawut M