Firefox disable QUIC protocol

General system Applications
1

I’ve been trying to disable QUIC protocol but Firefox is still trying to use it…
I noticed that it is trying to bypass my DNS server resolving names directly through QUIC.

Is this the right option ?

user_pref("network.http.http3.enabled", false); ← Disabling QUIC

Really weird because I’m observing connections to UDP/443 to the following IPs:

151.101.177.229 (not sure what IP is this)
104.16.0.0/12 < a lot of IPs from this network (Cloudflare)

If someone know how to do it, kindly share, thanks.

2

I found disabling http3 made all the google properties load faster.

3

hm, good to know… But is it working for you ? I disabled it using the method mentioned in my first post but it is definitely not disabled… Perhaps some hardcoded thing in the browser ?

Edit:

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As you can see above, more than 4k attempts to use UDP 443… And increasing…

4

what are you using/doing to generate that graph?

5

Graylog server running in a raspberry pi 4b.
Graylog is a Syslog/Netflow server that uses mongodb and elasticsearch/or/opensearch.

So, basically my home is my lab, and I use it to apply these configurations to some customers.
I’m exporting logs and netflow data from my devices to it…

I removed some sensitive data, such as countries names I’m blocking through geoIP so people don’t get upset because I’m blocking their countries.
Removed some hostnames and IP addresses too.

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6

You know the forum software will poll for changes

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You can go to any page you are on and bring up developer tools to see what connections are being made and if they are failing

7

This shouldn’t be necessary because I’m disabling right at the user.js file ?
I’ll try to confirm what website is triggering it, but even if I find out, this shouldn’t be happening.
There is something hardcoded in the browser, or the network.http.http3.enabled is not working…

8

If you can find the page that is doing http/3 let me know and I will look on my end as well