All my ports closed. even if forwaded

trungkiencfc

Prominent
Oct 21, 2017
2
0
510
Im using TP-LINK TL-WR740N and I've just bought BO3. My nat is strict and i've tried to forward all the ports (27017,etc) and checked the ports by Simple Port Tester, it shows those ports are closed on my ip. I also checked some well-known ports like 80,443 but they're still closed. Am i doing anything wrong ? or something happens to my router

I need my nat open to coop with my friends. i really enjoy BO3 btw