Fastvue Site Clean depends on information in log data to determine the Origin Domain of a web resource. If there is not enough information in the log data to make this determination, the normal site domain is displayed – uncleaned.
The most common reason of an uncleaned or junky looking site ending up in your reports is when the Referrer URL is not logged, which is the case for HTTPS sites as the referrer header is not sent. The known list of CDNs (Domain Substitutes) can help pick up the slack here.
Fastvue Site clean also works best when the full URL is logged. For example, Fastvue Site clean can detect Facebook ‘like’ buttons by looking for URLs such as this:
However, when browsing HTTPS sites, only the site’s domain is logged. For example:
Fastvue Site Clean will therefore not detect a facebook like button in this situation. To improve this, try enabling HTTPS Inspection in your Web Gateway or UTM to log the full URL as though it was a normal resource transmitted over HTTP.
Fortunately, many CDNs and junk can be identified by the domain alone, and can be cleaned using the known list of Domain Substitutes and Junk URLs.