Port Forwarding ( Kali Linux )

hi guys,

I've an issue with port forwarding on kai .

everything is okay with router ( using Huawei e5770s )

and I used " gufw " to allow to the same port I opened in router.

also, I edited /proc/net/ip_forwarding "or something like that "

from 0 to 1

> and when I check on "canyouseeme.org" with nc .. there's no response :( !

Any HELP plz ? XD