For some context, here is my previous guide on fixing snowflake in whonix from earlier today.

https://forum.qubes-os.org/t/qubes-whonix-17-tor-snowflake-proxy-setup-guide-that-works/28844

In my last guide at the top of this post, I showed how to get snowflake proxy working in Qubes-Whonix(sys-whonix), by replacing the default (outdated?)bridges found in the whonix(qubes-whonix) snowflake documentation and bypassing qubes-whonix's Tor User Config, on top of configuring DNS settings specific to qubes-whonix. This guide will show you how to get the snowflake proxy in sys-whonix's Tor User Config working using the same principal, if you find that to be useful. (it feels nice to click snowflake and it not stop at 10%, and it frees up your Tor User Config)

If this has been done before, or if this is trivial/pointless then I apologize, but I like when things are made to be easy for people, and if I can help, I will(i hope I'm helping at least). So here we go.

This guide assumes the user has already configured sys-whonix's dns using sudoedit /etc/resolv.conf.whonix and setting the output of qubesdb-read /qubes-netvm-primary-dns as nameserver near the bottom of the file by uncommenting it and changing the ip. It also assumes the user has copied and installed snowflake-client by copying it from the whonix-workstation-17 template to the whonix-gateway-17 template in /usr/bin , and making the file executable.

EDIT: It might be wise to cut network access to sys-whonix while logged in as root

In dom0: qvm-run --user root sys-whonix xterm

In sys-whonix xterm:

cd /usr/share/anon-conection-wizard/

nano bridges_default

Replace the outdated snowflake bridges in the file to these newer ones from the tor project found at this link, I suggest the CDN77 bridges(option 2): https://forum.torproject.org/t/fix-problems-with-snowflake-since-2024-03-01-broker-failure-unexpected-error-no-answer/11755

CTRL+O then CTRL+ENTER (to save file) CTRL+x(to exit file)

Find your Tor Control Panel under Main Qubes Menu > Services > sys-whonix > Tor Control Panel

Click stop Tor

Click Configure

Select snowflake as your bridge type

Start Tor

It should look like this.

Snowflake should connect fine.