Hi, I have install squid server with NTLM windows authentication. The proxy server is working and I am able to use MSN messenging. However I am unable to use yahoo messenger. I have added the following but it is still not working. acl Safe_ports port 5000-5010 # Yahoo Messenger acl Safe_ports port 5050 # Yahoo Messenger acl Safe_ports port 1863 # MSN Messenger Can anyone pls advise? Thanks. Rgds, Kelvin