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Users always get the FBA page when they access OWA or ECP in Exchange Server 2013

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Symptoms

Assume that you use the following command to enable Integrated Windows Authentication or Basic Authentication:

Set-OwaVirtualDirectory “CAS1\owa (Default Web Site)” -WindowsAuthentication $true -BasicAuthentication $trueSet-ECPVirtualDirectory “CAS1\ecp (Default Web Site)” -WindowsAuthentication $true -BasicAuthentication $true

After you do this, FormsAuthentication is displayed as disabled in the Outlook Web Access (OWA) and Exchange Control Panel (ECP) virtual directories:

ClientAuthCleanupLevel : High
BasicAuthentication : True
WindowsAuthentication : True
DigestAuthentication : False
FormsAuthentication : False
LiveIdAuthentication : False
AdfsAuthentication : False
OAuthAuthentication : False
ExternalAuthenticationMethods : {Fba}
However, clients keep encountering forms-based authentication (FBA) when they try to log on to OWA or ECP.

Note Clients can log on successfully after they provide the correct credentials.

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Resolution

To resolve this issue, install the following cumulative update:
2936880 Cumulative Update 5 for Exchange Server 2013

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Workaround

To work around this issue, make sure that you specify -FormsAuthentication $false when you disable FBA and enable other authentication types in the OWA or ECP virtual directories. To do this, follow these steps:
  1. Enable forms-based authentication.
    • For OWA, run the following command:

      Set-OwaVirtualDirectory -Identity "CAS1\owa (Default Web Site)" -FormsAuthentication $True
    • For ECP, run the following command:

      Set-ECPVirtualDirectory -Identity "CAS1\ECP (Default Web Site)" -FormsAuthentication $True
  2. Enable the authentication type that you want, and specify -FormsAuthentication $false.
    • For OWA, run the following command:

      Set-OwaVirtualDirectory -Identity "CAS1\owa (Default Web Site)" -FormsAuthentication $False -WindowsAuthentication $true -BasicAuthentication $true
    • For ECP, run the following command:

      Set-ECPVirtualDirectory -Identity "CAS1\ECP (Default Web Site)" -FormsAuthentication $False -WindowsAuthentication $True -BasicAuthentication $True
  3. Perform an IISReset operation. For more information about how to do this, see How to restart IIS.

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Keywords: kb, kbexpertiseadvanced, kbfix, kbqfe, kbsurveynew

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Article Info
Article ID : 2925559
Revision : 2
Created on : 8/13/2020
Published on : 8/13/2020
Exists online : False
Views : 375