All,

I have two separate implementations of Exchange 2013/Server 2012 posting the same issue.  When logging into ECP, the login page is displayed correctly.  The url is shown correctly (edited for security). 

https://localhost/ecp/?ExchClientVer=15; Accept the cetificate mismatch warning, go to the EAC login page,

https://localhost/owa/auth/logon.aspx?replaceCurrent=1&url=https%3a%2f%2flocalhost%2fecp%2f%3fExchClientVer%3d15 .

Note that OWA handles the authentication (https://localhost/owa/auth/logon.aspx) but redirects the authentication results back to the ECP page (?replaceCurrent=1&url=https%3a%2f%2flocalhost%2fecp%2f%3fExchClientVer%3d15).  When the credentials are entered, the user is authenticated correctly but the redirect does not process and the user is logged into the OWA page (https://mail.domain.net/owa/#path=/mail).  Also note that the primary address is changed from localhost to the public url for OWA.

In each instance, there are other Exchange servers that login correctly to ECP.  The other servers are dedicated CAS role where the servers having the issue are all in one servers.  I suspect this is an IIS issue but I would appreciate any input.  

Hi,

According to your post, I understand that ECP login page will redirect to OWA after the credentials are entered.
If I misunderstand your concern, please do not hesitate to let me know.

First, please upgrade Exchange server to latest version for testing. Also confirm whether you modify the configuration before this issue arise.

Then, please try to login ECP with CAS FQDN for testing, for example https://<CAS FQDN>/ecp/?ExchClientVer=15. Open IIS management, try to disable the HTTP Rediect setting for Default Web site, ECP and OWA.

If the issue presists, run Get-EcpVirtualDirectory | FL, Get-OwaVirtualDirectory | FL and post result without sensitive information. Also, check the login process by IIS log(%systemDriver%\Interpub\logs\logfiles).

Thanks