Server ports and failing to log in to client

What ports should my server use to avoid not being able to sign in on the client? I could use 7778, 7779, 27106 UDP before on my server for 150 hours (though many more of up time) of play time just fine. But now nothing I do will let my server and client run together. Can anyone suggest a course of action? I’d love to play with my friends again.

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