Finally getting back to this. Thanks for the earlier responses. I changed cache_peer to use front-end-https=auto, but no change in behavior. This may be a stupid question. I'm wondering if my problem is due to the fact that I'm using the same squid as an accelerator for OWA to the same Exchange box: https_port a.b.c.d:443 cert=/usr/share/ssl/combined.crt key=/usr/share/ssl/owa.key defaultsite=owa.xx.com https_port a.b.c.e:443 cert=/usr/share/ssl/rpc.pem defaultsite=rpc.xx.com cache_peer ip_of_exchange parent 80 0 no-query originserver front-end-https=on login=PASS cache_peer ip_of_exchange parent 80 0 no-query originserver login=PASS front-end-https=auto name=exchange_rpc The OWA config works and I'm trying to add rpc over http. OL will not connect and nothing shows up in access.log. Running tcpdump on the external port on the squid box, I see incoming connection attempts from the client, but squid seems to be ignoring. Nothing is passed to the exchange server. Thanks, Alan -----Original Message----- From: Henrik Nordstrom [mailto:henrik@xxxxxxxxxxxxxxxxxxx] Sent: Monday, May 26, 2008 1:04 PM To: Alan Lehman Cc: squid-users@xxxxxxxxxxxxxxx Subject: Re: rpc over http problems On mån, 2008-05-26 at 12:48 -0500, Alan Lehman wrote: > cache_peer ip_of_exchange parent 80 0 no-query originserver login=PASS > ssl sslcert=/usr/share/ssl/rpc.pem name=exchange_rpc This tells Squid that it should use SSL encryption to connect to the peer on port 80. Looks wrongto me. Remove the ssl and sslcert options, and replace them with front-end-https=auto instead. Should match yout requirements better.. Regards Henrik