Resetting the OWA connection

If Office Web Apps (OWA) stops working, you may need to rebind SharePoint to the Office Web Apps server. You do this by following these steps.

1. Open up the “SharePoint 2013 Management Shell” on one of the application servers using “run as administrator”.
2. Remove all previous bindings by running the following command.
   
   Remove-SPWOPIBinding -All:$true
   
   
3. Set the WOPI zone by running the following command.
   
   set-spwopizone -zone external-https
   
   
4. Recreate the binding by running the following command (assuming the office web apps server is prod-owa1).
   
   New-SPWOPIBinding -ServerName “prod-owa1”
   
   
5. Then start a full search crawl on all the content on the farm.