My friend cant join my game and vice versa
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Whenever i launch a server it doesnt give me any errors at all but whenever my friends tries to join me(double clicks my name) it doesnt do anything(and yeah it says playing in a private match next to my name). It was all working fine just yesterday but now i can neither join my friend nor can he join me and I have no clue why, we also tried connecting by ip and still nothing
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If the host didn't port forward then do it as it's the only reliable way to make it work all the time.
If he did then most likely his PC's local IPv4 changed which means the rule he created before isn't assigned to his PC anymore so he needs to update the rule (and set a static IP if he doesn't want this to happen in the future)
https://plutonium.pw/docs/custom-games/#if-upnp-is-still-disabled-or-you-cant-connect-despite-it-being-enabled