Which client do you use?
Look at your port number on it and forward it on your router.
I think you can access your router's web and change your settings as well on here:
http://192.168.0.1
or here:
http://192.168.1.1
Look for some option as Port Forwarding, or NAPT, or similar, and add the port of your client to the list.
Hope it helps.
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