I have ISA 2000 configured in proxy mode, working as a URL filter. Now i have purchased a Instant messenger Managing software to manage MSN trafic which uses Socks 5. Both are installed on the same server. When i configure proxy address in IE my entire MSN traffic is blocked by ISA, otherwise it is OK. I tried by istalling IM software on another server but no luck. Either I want to bypass ISA for Yahoo and MSN or how can i enable IM traffic based on user accounts on ISA. I tried by adding content filtering but i can only do with IP address. I dont want any user autentication, if i try with domain user accounts ISA always asking password. Is there any seeting to filter ISA trafic based on user accounts without any authentication. I dont want use Client sets. I have fed up with MS ISA. Dont send me any isaserver.org link to block IM's. I need a proper solutions.