Exchange 2013 OWA Issue

Hello Experts,

I have two Exchange servers, both setup (as far as I can tell) identically to one another, both running CAS and Mailbox. However, they are each at different locations and subnets. When I browse to OWA on MailServer1, I get prompted with the normal windows prompt for username & password and I can log in just find.
prompt1.jpg
When I browse to MailServer2, I get the OWA login prompt and am unable to login. I get the "user name or password isn't correct" message.
prompt2.jpg
The only difference I can see on each of the servers is that OWA virtual directory for MailServer1 states that it's version "Exchange 2010" and for MailServer2 it is "Exchange 2013". Could this be the issue? Please help!

Thanks.
nreichAsked:
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Adam FarageEnterprise ArchCommented:
Where is the mailbox located when you attempt to login, Exchange 2013 or Exchange 2013. This very well could be a proxy / redirection issue, and since the first screenshot looks like its not FBA (Basic authentication) you might have to change the Exchange 2010 OWA virtual directory from NTLM authentication to FBA.

Let us know where the users mailbox sites first, and then we can go from there.
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nreichAuthor Commented:
Both Exchange servers are in a DAG and the mailboxes currently reside on MailServer1 (with a copy on MailServer2). Authentication for the Default Web Site's OWA directory is Windows Authentication and for the Back End it is Anonymous and Windows Authentication; set on both servers.
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Adam FarageEnterprise ArchCommented:
Can you explain this a tad bit further then, because I am not following:

The only difference I can see on each of the servers is that OWA virtual directory for MailServer1 states that it's version "Exchange 2010" and for MailServer2 it is "Exchange 2013". Could this be the issue? Please help!
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nreichAuthor Commented:
I've posted this pic below to help explain further visually...
owaConfig.png
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Adam FarageEnterprise ArchCommented:
The first screenshot, where does that OWA virtual directory sit? Is it an Exchange 2010 server or 2013?
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nreichAuthor Commented:
Both servers are running Windows 2012 with Exchange 2013 SP1 CU4. Here are the OWA paths...

MailServer1

Default Web Site: c:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\owa
Back End: c:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\owa

MailServer2

Default Web Site: c:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\owa
Back End: c:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\owa
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nreichAuthor Commented:
After digging much more, I discovered that the directory "auth" under the virtual directory owa on MailServer2 was set to Form Authentication. I wasn't allowed to modify the setting in this section - kept getting a message "This feature has been locked and is read-only". So I copied the web.config file from my owa path of MailServer1 and performed and IIS reset. Forms Authentication is now disabled and I'm able to log into Webmail/OWA on MailServer2 just fine.
authperm.png
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nreichAuthor Commented:
My own solution.
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