Port Forwarding to/from Raspberry Pi

[wireless]

Hi All,

I am having issues with port forwarding on the T1200H router. I configured the router ports 1880, 1883 and 8123
to be forwarded to my Raspberry Pi 3 device. The Pi works perfectly on the private IP (192.168.1.74:1880, etc.) side
but I need to access it from the Public IP port side (e.g. 75.157.52.202:1880, etc.).
I tested the ports with http://www.yougetsignal.com and all the ports that I configured open fine but I still can't get through to the Raspberry Pi.
Any suggestions as to what could be the problem? The Pi is a wireless device. When I access in on the privet side the get
a proper login page and all works fine. From the public side it simply times out. How can I test it to get further clues?
Thanks,
JG


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