unable to connect to HTTP and SSH from the web on NetHunter

Hi every one,
I just tried to find any solutions about my trouble but nothing find anywhere... so:
I want to connect to my device from the web to use some reverse shell ... I used the external IP but no way to connect... so I enabled web server and locally it works well but impossible to get it from web ... no way to open the HTTP page or ssh connection... any help or hint? it looks like some NAT PAT trouble... but how to solve it?

tnx! i.

yes, I m using nethunter on ONEPLUS, and this is my first post here... and my englis is so poor... :p sorry