Test the Office Online Server connection
You can test if the specified address points to a valid Office Online Server by opening the <OOS_Server_URL>/hosting/discovery page where <OOS_Server_URL> is the URL specified in the Office Online Server URL field
When the discovery page is opened in Internet Explorer, an XML file will be opened containing multiple XML tags.
Locate the urlsrc attributes in the XML and investigate if the urlsrc attributes all point to the same Office Online Server URL. These urls are used when WZC interacts with the Office Online Server. The Office Online Server URL address defined in the WorkZone Configurator is used by WorkZone Content Server to obtain the Office Online Server discovery XML information.
See Also
The Microsoft Office Online Server