My friend can only join my dedicated server when I do not have the game running.

[JAYxRAM]

As it stands, My friend can't join my dedicated server if my bo2 is even running. If the game is off, then he can join the server perfectly, otherwise, no.

[Resxt]

JAYxRAM https://plutonium.pw/docs/server/t6/setting-up-a-server/#additional-notes--faq