Can not creat a new session and stuck in waitpage.

[sojyu wong]

Hi everyone, I'm using NAT traversal to make my own PC as a server. When I run otree prodserver, I can creat session from localhost, but can not creat session from other clients of the external network, and other clients can enter the session created by localhost. In addition, all players will get stuck in the waitpage. That's strange, if anyone can solve the problem? I would appreciate it very much.