Why URL filter is not able to block mobile network?

Yes setting up the right firewall rules! :thinking:

Here you go with my config (German though) that does the thing!

  1. Proxy settings: Network -> Web-Proxy

  1. Firewall -> Firewall Options

  1. Firewall -> Firewall Rules

// Just ignore any rules for services you may not use!

But keep in mind you can’t do that for mobile devices.