I have a server running Windows 2008R2 SP1 with Exchange Server 2010.  This server is a rebuild of an Exchange server that crashed in Dec. 2014 (no other information provided).  As of 3 weeks ago, users from the Central Office group are getting the "Out of Office not working, server unavailable" message".  There is also certificate popups and MailTips can't be shown for some users.  Certificate popups for the old (crashed) computer also keep showing up despite our best efforts to remove in DNS.   (Putting in as much info as possible).  There were entries in DNS for the crashed server that has since been removed.  I would appreciate some pointers on where to look in troubleshooting this issue as I am not an Exchange Administrator but quickly learning.  I have also read that there may be KBs that were pushed out that may cause these symptoms. 

Thanks in advance for your help

• Edited by GeJaeger Wednesday, July 15, 2015 9:42 PM

Firstly you need to check servers EWS urls to make sure they conform to the standard URLs deployed. May be the new server is using server FQDN which is not on the certificate. And possibly server registration for DNS is incorroect?

Also check your autodiscover service is working correctly. 

HTH

Abhi

Hello Lynn-Li:

I ran your checks as suggested.  For the server,  the External Url comes back as the "old crashed" server.  (This result yielded from "Get-WebServicesVirtualDirectory -Identity" . . . from your suggested check.  The question, where in the IIS\EWS directory do I access to correct and input the current server?  I am not familiar with IIS either. 

Also, Abhi:

Where do I find the correct certificate on the server to check the names? I'm clear on what to look for.  I know how to get into the Certificate snap-in. 

TIA, 

Georgia Jaeger

Also, Abhi:

Where do I find the correct certificate on the server to check the names? I'm clear on what to look for.  I know how to get into the Certificate snap-in. 

Thanks!