You have to have the entire range of ports 7100 to 7500 open to use any of those ports. Example, 7100, 7101, 7102, 7103, 7104 ......and all the way up to 7500. When you forward ports in your router, can you use port range forwarding ? Meaning that you can forward that whole range in one entry. NOT just 2 of them (7100 and 7500) it has to be all of them inbetween.
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