Damien Check your IIS certs and make sure you¹re not using a self signed one.
Deb From: <[email protected]> on behalf of Damien Solodow <[email protected]> Reply-To: <[email protected]> Date: Wednesday, October 12, 2016 at 14:46 To: "[email protected]" <[email protected]> Subject: [Exchange] Outlook certificate error? We¹ve been intermittently finding an odd issue; Outlook will pop-up the following message: There is a problem with the proxy server¹s security certificate. Outlook is unable to connect to the proxy server FQDN. (Error Code 80000000). Clicking Ok on the message gets rid of it and Outlook acts normal. I¹ve looked at the Outlook connection status while the message is onscreen, and it shows successful connections to HTTPS as well as usually a disconnected one for the mailbox. OWA doesn¹t show any cert issues, and it¹s sporadic. Exchange 2010 SP3, CU14 on Windows Server 2008 R2 SP1.k Clients are Windows 7 SP1 x64, with Outlook 2013 SP1 x86. Our CAS servers are behind an F5-LTM doing SSL off-load. This isn¹t a new setup; the issue start occurring in the couple months as far as I¹ve been able to determine. DAMIEN SOLODOW Senior Systems Engineer 317.447.6033 (office) HARRISON COLLEGE 550 East Washington Street Indianapolis, IN 46204 www.harrison.edu <http://www.harrison.edu/>
