Office Web Apps for SharePoint on-premise

My Office Web Apps (Office Online Server--OOS--in my case) server stopped rendering Office Docs with an error:


Sorry, there was a problem and we can't open this document. If this happens again, try opening the document in Microsoft Word.


The error also included a session ID. I was able to find the session ID in the ULS logs but it didn't seem to help as the error was quite generic. I had a load balanced pair. It made troubleshooting less than ideal.


Nothing I did to try and resolve it made any difference. Configuring OOS or reconfiguring is really super simple and requires only a few minutes of downtime. It's so quick to rebuild OOS or OWA by following these steps in this link:
https://blogs.technet.microsoft.com/office_web_apps_server_2013_support_blog/2013/12/20/office-web-apps-2013-rebuild-your-farm-in-a-few-easy-steps/


Open PowerShell and let's fix it!


Remove-OfficeWebAppsMachine on both OOS servers. Reboot after the command completes.


Next I ran this command on the "first" OOS server (Quotes around the certificate name and URL are getting stripped out of this page):

New-OfficeWebAppsFarm -InternalURL "https://OOSserver.fqdn.domain.com"  -EditingEnabled -OpenFromURLEnabled -CertificateName "cert-friendly-name"


On the second, load balanced OOS machine I ran this command:
New-OfficeWebAppsMachine -MachineToJoin OOSserver.fqdn.domain.com


Then on one of the SharePoint servers I ran these two commands:

Remove-SPWOPIBinding -All:$true
New-SPWOPIBinding -ServerName "OOSserver.fqdn.domain.com"


Tested and it worked! Quick rebuild and back online in a few minutes!

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