SharePoint Error on Office Online: The open operation did not complete within the allotted timeout of 00:01:00

Symptoms

When one tries to open an Office Online document, SharePoint gives the “Sorry, something went wrong” error message with a Correlation ID. All Office Online Server members in the farm work fine via https://<officeonlineUrl>/op/generate.aspx. However, the associated Correlation ID on the SharePoint ULS shows "System.TimoutException: The open operation did not complete within the allotted timeout of 00:01:00", and it stems from SPApplicationSecurityTokenServiceClient:

























Diagnosis


IIS shows SecurityTokenServiceApplicationPool is running, but it malfunctions according to the Windows event logs. 


Remedy


Recycle the SecurityTokenServiceApplicationPool on the identified server in ULS (highlighte):



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