Today, I faced an issue where I implemented an Office Online server (formerly know as Office Web App server or WAC) for a customer. Presentation was working well internally but was stuck in Loading when trying from an external connection.
This Office Web App server was published via an F5.
So I launched Fiddler and enabled HTTPS decryption like below:
Launch Fiddler -> Tools -> Fiddler Options -> HTTPS -> Decrypt HTTPS traffic -> Install fiddler Root Certificate
This makes me able to retrieve the complete URL
And I tried to access this URL from my web browser and got this error :
The requested URL was rejected. Please consult with your administrator.
Your support ID is: 3105466502033495217
I did the same test from an internal connection and got the presentation in the web browser so I knew that the F5 was sending this error.
The IT guy who is managing the F5 found that it was caused by a parameter called “Enforcement Mode” in the “Application Security” part. It was set to “Blocking” and as soon as he changed it to “Transparent”, Presentation started to work externally.
Hope this will help you