Are you using the standard webmail templates? Off subject, but I hope you are running 8.22 fully patched. John T eServices For You "Life is a succession of lessons which must be lived to be understood." Ralph Waldo Emerson (1802-1882) -----Original Message----- From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Paul Laudenslager Sent: Sunday, December 31, 2006 8:32 AM To: isalist@xxxxxxxxxxxxx Cc: support-team@xxxxxxxxxxxxxxxxxxxxxxxxxxxx Subject: [isalist] webmail attachment problems... Hi Everyone, It's been awhile since I've been here and I hope that everyone is doing well. I posted this issue once before several months ago but I never followed through.. (sorry!) so I'm asking for your help again. ISA 2006 Enterprise Edition IPSwitch IMail v8.x (on private IP behind firewall) Users are on public IP's not protected by the firewall. Users are getting the following error in their browser trying to view attachments (ie. pdf's and doc files) via webmail. "Error Code: 500 Internal Server Error. The HTTP message includes an unsupported header or an unsupported combination of headers. (12156)" When I access webmail with a PRIVATE IP address (not going through the firewall) the attachment opens just fine. When accessing the mail server via POP/IMAP, the attachment works just fine. Also, even weirder, if a user FORWARDS the email with the attachment to themselves, it then opens just fine through the firewall... Hmm... I've tried deleting/recreating the rules on the firewall to no avail. I've also created the rule when unchecking the "compression" checkbox... and unchecking the "enable http compression" checkboxes... to no avail. My other IMail servers NOT behind the firewall work just fine... only those behind the 2k6 firewall are failing. NOTE: I also didn't have this problem with ISA 2k4. 1. What's a good way to view the ISA log files to find out exactly WHAT HEADER is causing the problem? 2. If I do find out what header is causing this issue, where would I go from there? Thanks again for your time and consideration. I really do appreciate it. I hope that everyone is having a wonderful holiday season. Paul L.