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Welcome!What Hardware version is your router? Look at sticker under router.
Link>What
Firmware version is currently loaded? Found on routers web page under status.
What region are you located?
What ISP Service do you have? Cable or DSL?
What ISP Modem do you have? Stand Alone or built in router?
What ISP Modem make and model do you have?
You might try configuring Virtual Server or PF for and see if you can get this going.
You'll need to disable uPnP under Advanced/Advanced Networking if you configure PF.