Port 9987 Will not open, No matter what i try

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Hey guys i know a lot of people have asked/ said this a lot but I've followed every single one of the threads and nothing is working. So basically I'm trying to start up a dedicated server for me and my mates as a gaming server (5-10 people) and everything works fine server wide. Now I'm not... Port 9987 Will not open, No matter what i try