How do I block all outgoing Steam connections on my PC?

[AOE2.GG | MattWithAHat]

Hello,
I want to block all outgoing Steam connections with the internet on my PC (using Windows 10 Pro). I have tried using the Windows Firewall, by defining outgoing rules. I have already blocked these files/paths from accessing the internet with the Windows firewall:
C:\ProgramFiles (x86)\Steam\steam.exe
C:\Program Files (x86)\Common Files\Steam
C:\Program Files (x86)\Steam\bin\cef\cef.win7x64
C:\ProgramFiles (x86)\Steam\

None of these rules worked.

Before anyone asks: I use the antivirus software Avira but it's set up to let Windows manage the firewall, so I don't think it's messing anything up here.

I also read somewhere that you can use NetLimiter to block Steam. So that's what I did. I blocked everything Steam related that NetLimited could find:
https://ibb.co/dGR3D85

Maybe I'm missing a process that doesn't have "steam" in its name but is used by Steam?

There also seems to be a way to do it with the hosts file, but I couldn't find any clear information on what exactly has to be put in there.

I don't want to block Steam in my router, since I live in a shared dorm and my housemates need to have access to Steam. Disabling my connection entirely is also not an option, I still want to have internet access.

Does anyone know how to do this or have an idea what I'm doing wrong with the firewall or NetLimiter?

[Supafly]

Wouldn't it just be easier to put Steam in offline mode?

[Iceira]

why do you need our help to lookup steam ports ( im sorry if this is to obvious for rest of us and that why i reply so you learn to do that next time with whatever app name and issue. )
https://help.steampowered.com/en/faqs/view/2EA8-4D75-DA21-31EB

ps.
i did not say you cant have issue with the app, not the first time a network engineer caught a security app not work as intended. ( even seen configuration so screwed up that it make no sense or bad translation and some option is reversed. )

[AOE2.GG | MattWithAHat]

Originally posted by |<- Iceira ->|:

why do you need our help to lookup steam ports ( im sorry if this is to obvious for rest of us and that why i reply so you learn to do that next time with whatever app name and issue. )
https://help.steampowered.com/en/faqs/view/2EA8-4D75-DA21-31EB

ps.
i did not say you cant have issue with the app, not the first time a network engineer caught a security app not work as intended. ( even seen configuration so screwed up that it make no sense or bad translation and some option is reversed. )

Because I simply did not know that that is an option to block the connection. You can't assume that everyone on Steam is super tech savvy. I block these with the firewall, yes? Is there a risk that other applications use these ports?

[ReBoot]

Don't block ports, block processes/binaries.