Server Error in '/owa' Application. Runtime Error Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed. Details: To enable the details of this specific error message to be viewable on the local server machine, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "RemoteOnly". To enable the details to be viewable on remote machines, please set "mode" to "Off". <!-- Web.Config Configuration File --> <configuration> <system.web> <customErrors mode="RemoteOnly"/> </system.web> </configuration> Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL. <!-- Web.Config Configuration File --> <configuration> <system.web> <customErrors mode="On" defaultRedirect="mycustompage.htm"/> </system.web> </configuration>

It's great that you posted the full error message. It would be even more helpful if you were to share (1) the version, service pack and rollup hotfix level of Exchange, (2) what you're doing that makes the error happen, and (3) what path you are taking to get to OWA, i.e., is it through a web proxy or some other device.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi, Agree with Ed. Please post more detail information. You can first try to create a new OWA and then test to see if the issue persists.: Remove-OwaVirtualDirectory -Identity "owa (default Web site)" New-OwaVirtualDirectory Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Thanks Gen Lin-MSFT