I tried in previous post to change the established connection when the time of the delay_pool change. Amos give me 3 solution and now I'm trying with QoS, but I have this idea: If I have 2, 3 or the count of squid.conf that I could need, and with one script I make squid3 -k reconfigure. That not finish any active connection and apply the changes, what do you think? Remember that I have Ubuntu 10.04 with Squid 3 STABLE1. This night when my users gone I gonna try !! Tomorrow I tell you, but if someone tried this, please, send the result, so i can use my time in QoS.