Issue with logging onto P99 (other games connect)

[Swiftyfist]

Hello! I have been been getting very down on this issue.
I recently switched internet to a t-mobile provider (dont get cable where i live)
its basically my only option to where other internet plans are too expensive.
Right now i have a AT-T hotspot for another two days. P99 connects fine!!! no issues
But with my new connection it will not connect. to where it will connect to CS:GO - RUST - basically any other game i own. just not P99
i am not tech savvy and am looking into port forwarding but having issues and cant get it to work
please any ideas or suggestions.

i also ruled out it being a computer/game issue because ATT connection works fine.

checked firewalls and anti virus they are not causing this issue.

does anyone have the port info i need for port forwarding and or maybe to help walk me thru it?
thank you guys for your time, i hope i get up and running soon [You must be logged in to view images. Log in or Register.]
-Swiftyfist