Downloading doesn't work after unlocking ports

[KyluAce]

I'm created software to updating content on some devices that basing on this library. There was no problems at all but when I delivered it to the clinet it turned out that their WIFI have some limitations. So they wanted to know what protocols and ports needs to unlock to makes it worked. So i give them respond that I need unlocked TCP and UDP protocols and 6881-6889 (BitTorrent traffic) and 6969 (tracker port). They unlocked it but it still doesn't work (downloading stuck on 0%). Am I missing something or this ports are wrong ?

[Dead-off]

The library uses these ports that you're mentioned. I don't know why the download can be stuck. Maybe some logs may be helpful.