The UTM uses a couple of different categorization databases, one internal and the other third party. Check the specific URLs being categorized this way at trustedsource.org/.../url , use the Smartfilter XL database. If the checks show Web Ads, create an account and recommend a categorization change. The other can be recommended for a change at secure2.sophos.com/.../reassessment-request.aspx . The other option would be to go to Web Protection > Filtering Options > Exceptions and create an exception to skip URL Filter for all requests "Matching these URLs".
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