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Can I use Web Filter to block HTTPS/SSL sites?

Yes - because Web Filter has access to a separate database of IP addresses, it can categorize HTTPS traffic based on the destination IP address. This is not done by individual domain, but by category - for example, if you simply block 'facebook.com'. Please note that this does not mean Web Filter can parse HTTPS as it is encrypted. Categorization is done via IP address. This means other forms of blocking like URL, file-type, mime-type, etc can not be done on HTTPS as the stream is encrypted and these require parsing of the HTTP protocol.  However with the combined use of the SSL Inspector Application and Web Filter we can indeed scan/block HTTPS traffic as expected.  

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