I'm starting to run out of ideas. I have Exchange 2010 running on SBS 2011, just set up Exchange yesterday after exporting the PSTS from users exchange online accounts. I then deleted their mail profiles and created new ones for the on-premises exchange.
I have 5 Windows clients with Outlook 2013.
2 of them can connect to their exchange accounts no problem.
the others get Login Credential Spammed that autofills in their e-mail address and asks for their password, what's odd is that they can click cancel, then at the bottom of outlook where it says "Need a password" if they click that, it shows connected to exchange and they don't get spammed for a while.
Even more odd... User A's outlook on Computer A is working great, User B on Computer B is getting spammed for login credentials. When I tried logging into Computer A as User B, I was able to create an outlook profile and NO SPAM. So then I try logging into computer B as User A and again NO SPAM.. So I can't narrow it down to user or computer! I'm about to cry lol, Also, put User A back on Computer A, works fine, but User B back on Computer B is still having issue. I've tried deleting their profiles again and same thing.
For the record...
I have a UCC SSL Cert covering
and I have an "A HOST" set to my external IP and owa.domainname.com and autodiscover.domainname.com as CNAME aliases to "remote.domainname.com". I have ports 25,80,443 forwarded to the server.
I installed SP3 update with no issues
I've enabled kernel authentication mode in ISS Virtual Directories "Autodiscover", "EWS", "RPC"
I've tried gpupdates, dns flushing, and restarts
I've also tried every kind of authentication method in Outlook with no change. Changing the method on the Working outlooks did NOT break them!
Any ideas oh saviors of my sanity?