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On the same PC: Ad Block works in Firefox but not on Chrome.

JasmineMaier

Chrome skips Ad Blocking and displays the ads.

Ad-Blocking works:

  • UTM Policy Checker
  • Firefox as browser

Sophos UTM 9.410-6.

All happening on the same PC running Ubuntu 16.04.
(Tested chrome on another Windows PC behind the same UTM. Blocking works as expected...)

As this sounds not logical to me: See screen video at https://youtu.be/D5gqOmnB81M

 

 



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  • 0

    I got exactly the same problem. It seems like google chrome is ignoring the self created CA certificate for the (google own) domains like "google.com" or "youtube.com". Please look in your certificate chain. In my case my SSL-certificate is not used for those sites. On all other "not google" sites, the certificate works as expected.

  • 0

    Hi Jasime,

    Configure a FW-Rule to drop UDP 443 services. Also, check out the below link which has some useful tricks. Any help with that?

    https://community.sophos.com/products/unified-threat-management/f/web-protection-web-filtering-application-visibility-control/46207/speeding-up-webbrowsing-by-blocking-advertisers-and-trackers

    Thanks

    Sachin Gurung
    Team Lead | Sophos Technical Support
    Knowledge Base  |  @SophosSupport  |  Video tutorials
    Remember to like a post.  If a post (on a question thread) solves your question use the 'This helped me' link.

  • 0

    Jasmine, I've moved this thread to the Web Protection forum.

    Sachin's approach will block Chrome from communicating on UDP 443 with Google servers, thus forcing Chrome to use TCP 443.  An alternative might be to use Standard mode and add UDP 443 to 'Allowed Target Services' on the 'Misc' tab of 'Filtering Options'.  If you try that and it works, please let us know if the Proxy can do HTTPS with UDP 443 traffic.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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