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Using firewall rule XXXX -> ANY -> Internet causes YouTube connection speed to drop below usable rate on that device / network

Neblex

Hello Sophos Community,

I noticed a strange phenomenon when I wanted to set up a guest network.

Since this network has no access to other networks and should be able to browse the internet freely, I created a firewall rule as follows:

Guest network -> ANY -> Internet IPv4

This all worked at first, until I noticed that as soon as this firewall rule is switched on, the connection speed on Youtube completely collapses and only about 0.5 to 1s of video is buffered.

As soon as the rule is deactivated and e.g. web browsing is enabled for it, the connection speed is normal again.

Has anyone ever experienced this, or what could be the cause?



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