Plex not accessible from outside network

Since 2 weeks ago, my PMS is not accessible from the public network. I don’t know what went wrong, the server was working for years without any problems. I have been trying for days to solve the problem, but nothing helps.

Furthermore, I have reinstalled Plex without improvement.

The server is directly connected to the modem and there is no router in between.
The server has a static IP address and is also port forwarded.

I hope that one of you can find a solution.

Thanks,

Server Version#:v1.28.0.5999-97678ded3

Check your home router. It has to know to forward Plex traffic (typically TCP port 32400) to your server.