Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. If an Answer is helpful, please click " Accept Answer" and upvote it. Furthermore, you can go through the IIS logs which by default located at %SystemDrive%\inetpub\logs\LogFiles and see if any clues can be found. In case the above doesn't work, I'd recommend have a look at the Event Viewer on the Exchange server for any relevant events. Reference: Invalid username and password accessing OWA and ECP Get-OWAVirtualDirectory | Set-OWAVirtualDirectory -FormsAuthentication $True -BasicAuthentication $Trueįollowed by IISreset and also to recycle the app pools for OWA and ECP in IIS. With the above confirmed, it's suggested to try resetting FormsAuthentication for OWA virtual directory and restarting IIS to check the result: Get-OWAVirtualDirectory | Set-OWAVirtualDirectory -FormsAuthentication $False -BasicAuthentication $True Get-ActiveSyncVirtualDirectory -Server | fl *auth*īelow is the output returned in my Exchange 2019 test lab, you may compare it with your result and see they look the same: Hi this issue affecting all users in your organization?Īny changes were made in the environment right before the error started around 1 month ago?īased on my experience, please run the following command to check the authentication settings for OWA and Exchange ActiveSync: Get-OwaVirtualDirectory -Server | fl *auth*
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