Web Filtering is blocking server status

I have a web hosting control panel behind the Sophos UTM. Since turning on Sophos Web Filtering, everything seems to be working except for the licensing of the control panel. The control panel reverted to the free edition because Web Filtering is blocking something. However, nothing shows up as being blocked in the Web Filter log nor any other log that I have checked.

Everything goes back to normal when I turn of Web Filtering.

I tried disabling antivirus scanning on the policy->filter action->Antivirus tab, setting every category action to allow, removed all blocked file extensions from the Downloads tab, and added an exception for all of the vendor's websites.

Maybe the control panel's call is getting out but the reply from the vendor is being blocked???

What else should I check. I'm out of ideas.