Hello everyone - This is my first post so please bear with me if I've posted in the wrong section. Here is my scenario.
My organization is currently upgrading to Exchange 2013 from 2010. Over the weekend we performed the cutover from our single 2010 CAS to our two load balanced 2013 CASs. After the cutover we did extensive testing with connectivity to OWA, RPC,
Active-Sync, etc.
We conducted testing with 2010 & 2013 mailboxes. Everything was looking good. Our test users with a 2013 mailbox were able to log into the 2013 OWA and our test users with 2010 mailboxes were proxied to the 2010 OWA as expected both internally
and externally. In the same say, both types of users (2010,2013) running Outlook 2013 clients connected with no issues both internally and externally. In addition, mobile clients were working as expected for both types of users.
Here is the dilemma. After a few hours two users (not part of the test group) reported their Outlook 2013 client, mobile client, and OWA access weren't working. Their mailboxes are still on 2010.
I conducted a screen-share with one of the users and discovered that after the cutover, when he/she tried to log into OWA they would get to the login screen but after entering in their credentials the page would immediately go to a "Web page cannot
be found" message. I tried to eliminate this persons local machine and home network as the issue so I tested this persons account from a machine outside (my home network) and inside (laptop in our office) the corporate network. I received
the same results. I reached out to an individual who's mailbox was virtually identical to one of the users reporting the issue. This particular user was able to log into OWA with no issues both internally and externally. We also tested with
this users multiple clients (Outlook 2007, 2010, 2013), iPhone, Android, Windows clients. Everything for this user worked as expected.
At the end of the day we ended up rolling back to the 2010 CASs. After which the two users access to OWA, Outlook, Mobile client starting working again.
At this point I am completely at a loss.
I wish I had more technical information to provide such as Error Logs but I could not find a single error in the Event Logs for these particular users and this particular issue.
Any suggestions are welcome.
Thanks in advance.