Up until a few weeks ago, people were able to undock their laptops in the office with Outlook 2010 running, it would show disconnected for a few seconds and then automatically reconnect. Even if their laptop went to sleep Outlook would automatically reconnect once it woke up. Now after it disconnects it prompts for credentials, as well as displays an error stating "There is a problem with the proxy's security certificate. The name on the security certificate is invalid or does not match the target site webmail.company.com. Outlook is unable to connect to the proxy server".
So far I've tried enabling kernel mode authentication under the Windows Authentication setting for Autodiscover, EWS, OAB, and RPC virtual directories in IIS. I've also checked and the authentcation method used is NTLM. I do have "on slow networks use HTTP" checked, but "on fast networks use HTTP" is not checked. I tried checking that and it wouldn't let me log in at all.
I'm not sure what or if anything has changed right before this started as I had left the company a few months ago and came back right after this started.
Exchange is setup on 2 CAS/HUB servers, 2 Mailbox servers, and 1 EdgeTransport server. The version I'm running is Exchange 2010 SP2 Rollup 6 running on Server 2008 R2. Clients are Windows 7 Enterprise 64-bit.
I've read a lot of articles on this issue but none of what I've read and tried has seemed to work at all. Any ideas? It would be greatly appreciated.