Ports stopped working.

I used to use port 8001 for a lot of things. Recently, the port stopped working. I triple checked all my router settings and port 8001 is still forwarded. I tried other ports. I rebooted. I tried shutting off my firewall. Nothing worked. I really need a port working for various things so I need some help. Tell me if you need any additional information and I'll tell you. Does anyone know what I should do??

Well, I did everything you said and I'm sure I did it right. No luck. I have a feeling that something else is going on here, but I'm not sure what I should do. Anyone have any ideas?

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