Error: Unable to Join session is driving me crazy

[fefucho]

this shit is gonna melt my brain, at least tell me its plutonium servers not working sometimes, I have upnp enabled, tried with ports fordawerd, without, restarted game 3000 times, disabled firewall, sometimes randomly works, other times I cannot make it work, what the fuck is the problem? I tried making my friends forward ports and that doesnt make a change, either making them disable the firewall, I actually dont know what to do

[Resxt]

If it doesn't work reliably then yoir port forward rule is wrong or firewall issue etc
Also port forward rule is for the host. There are no issues with the servers it's on your side
https://plutonium.pw/docs/custom-games/