We have configured squid proxy server 2.6 STABLE in Fedora 6 box. We have given full time net access for particular users only. Remaining users will access the net at particular time only. But for skype access we have given access for all users. This is our code for skype access. acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Unreg_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl udpproto proto UDP http_access allow udpproto Safe_ports For all users skype is working fine. The limited (limited net access users) time users can able access some secure sites like gmail,hotmail & many banking sites due to this config "http_access allow udpproto Safe_ports". I want to allow only skype access not secute websites for limited users at restricted time.