Hi, I know that the MS Exchange problem has been done to death but I'm having trouble with our system and cannot find a solution in the mail archive or on google.com Running RedHat 7 (2.2.22-7.0.3) with squid 2.4.STABLE6 We have squid running as a transparent proxy server that uses a redirector process to verify that the incoming IP is enrolled. This works fine but we're getting more and more (misconfigured) OWA servers that use http instead of https making the requests go through squid instead of being direct. I have had to increase the number of redirectors to 32 to cope with whatever the exchange gateways are doing but unless we actually get the user to by-pass the squid cache completely the user can kind-of login but is asked to re-login all the time until they are eventually denied. There are no errors in the cache or access logs (e.g. extension_methods problem) so I'm stumped! Finally my real question: Is there a way to stop squid from being a proxy for certain addresses, such as an acl of acl to_exchange urlpath_regex /exchange Thanks in advance! Dylan