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Sophos UTM 9.603-1
The webfilter is blocking hundreds of ua="Microsoft BITS/7.8" requests per minute and I have added every possible combination of Microsoft BITS/7.8 to the PUA bypass. Apparently this is not a PUA but is categorized as UA which means unwanted application? This is confusing.
The BITS requests are attempting to be transferred under HTTP protocol and not securely through HTTPS. This happens every now and then and lasts for hours, even longer.
This problem first appeared in November with the release of 9.600, Alan. You might want to read the thread started then: Partial content (Range) rejected by proxy after upgrading to 9.6.
Cheers - Bob