Exchange 2010 – OWA and ECP not opening “”

Recently we had an issue with OWA. Page cannot be displayed with Hollowing error:

Error browsing OWA:
<!– Web.Config Configuration File –>

<configuration>
<system.web>
<customErrors mode=”RemoteOnly”/>
</system.web>
</configuration>

Hinweise: Die aktuelle Seite kann durch eine benutzerdefinierte Fehlerseite ersetzt werden, indem Sie das defaultRedirect-Attribut des <customErrors>-Konfigurationstags dieser Anwendung so setzen, das es auf einen benutzerdefinierten Fehlerseiten-URL zeigt.

<!– Web.Config Configuration File –>

<configuration>
<system.web>
<customErrors mode=”On” defaultRedirect=”mycustompage.htm”/>
</system.web>
</configuration>

This issue can be caused by corrupted web.config file in clinetaccess\owa .

Usually in this folder there is some web.bak file which is form the previous version of exchange server. This file can be renamed to web.config for troubleshooting purposes. After replacing this file the issue exist still. We event tooke a config file form working server.

The next step / possible solution was:

Navigated to C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG

Renamed web.config to .old and renamed web.config.default to web.config.

Ran iisreset in elevated command prompt

The issue still exists.

changed the %temp% and %tmp% variable path to the default Temp folder .

There can be also issues if the installation path for exchange is given with variables %exchangeinstallpath%. but this was not the case.

Since nothing from the steps above do not helped we decided to copy the clientaccess\owa folder from working server to the affected one.

After that OWA virtual Directory was recreated and the OWA can be open again.

Unfortunately it appeared that onli the Administrator can open OWA. We have errors in application log:

error 2280 with the description “The Module DLL C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa\auth\exppw.dll failed to load. The data is the error”

Found that the authenticated users have only read permissions on the DLL. Granted Read, Read&execute permissions to the dll and on the cline access folder.

After that all users are able to access OWA.

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