Online PowerPoint & SonicWall TZ-215

Hi Jim,

Hope you are well. As the applications are working outside the network then its likely sonic wall which is preventing them working as required. We see the same thing with proxies such as squid and Microsoft addressed this in the following article

https://blogs.technet.microsoft.com/fasttracktips/2017/08/25/why-we-recommend-not-using-proxy-with-office-365/

The Office 365 global URL's are here:

https://docs.microsoft.com/en-us/office365/enterprise/urls-and-ip-address-ranges#microsoft-365-common-and-office-online

Microsoft will likely ask you to add these in a bypass rule. That should fix the issue.

Best, Chris