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There is a sticky post already for this kind of issue but just to be clear are you connecting to the server outside where the server is or inside on the same system where you have the server running? Because if you are outside then you want to make sure all four ports are forward correctly. There is really not much to go off without more information or logs but if I had to say I bet you are missing the LoginREST external address and local which are not set correctly in your bnetserver conf file this happens to a lot of people that forget to set this which is the main reason why you get disconnected from server right away.