can't access from outside with nginx reverse proxy in docker

Question

i know there are lots of similar questions about but no one help me. I have a linux server running nginx reverse proxy in docker, a duckdns domain created,opened my router port 80 and 443. I can't access from outside with my domain name or public ip, it seems like my router refuses external request. I tried with lots of configuration, follow lots of guides on web... I get crazy to solve this problem. I think problem is before nginx, so i not post my nginx conf. If can help, I will post it. Hope someone can help me. Thank you so much