Plex Server on UGREEN NAS Accessible via HTTPS but Not Through Plex Web

Plex Media Server Remote Access
1

Server Version#: 1.43.4.10903-e5521bd8c
Player Version#: 4.162.1

Hello Plex Peoples,

I’m having trouble accessing my new Plex Media Server remotely through app.plex.tv.

This is my first time setting up a NAS, so I apologize in advance if I’m overlooking something simple or not explaining everything correctly. I’ve been troubleshooting this issue for several hours without much success.

My setup:

  • UGREEN DXP2800 NAS running UGOS Pro

  • Plex Media Server 1.43.4 via LinuxServer Docker

  • Docker networking set to Host

  • Cox Panoramic WiFi Gateway

  • TCP port 32400 forwarded to the NAS

  • Server successfully claimed and registered to my Plex account

I’ve confirmed that the server is running and accessible remotely. Both HTTP and HTTPS requests to my public IP on port 32400 return HTTP 200 OK. TLS 1.3 works, and the server presents a valid plex.direct certificate.

However, when selecting the NAS server through app.plex.tv, I receive a secure connection error and cannot access its settings or complete setup.

My existing Plex server on my MacBook Air works normally under the same account. Both servers have separate machine identifiers.

I’ve also ruled out browser caching, VPN interference, iCloud Private Relay, and Cox Advanced Security.

I’m wondering if this could be related to how Plex advertises its secure connection addresses or registers the server with Plex’s services, but I’m honestly not sure.

Again, I’m relatively new to NAS systems and Docker, so I apologize if I’ve missed something obvious. Any guidance or suggestions would be greatly appreciated.

Thank you for your time and assistance!

2

Have you configured the container to use “host” network? You absolutely should. There is no good reason not to do it.

Second thing: if you have more than one server running in the same home network, be sure to give each a separate port forwarding in your router. Each server has to have a different external/WAN port number.

3

Yes, my Docker container is already configured to use Host networking.

As for the second point, I do have another Plex server running on my MacBook Air, which was previously on the same home network as my NAS. However, I’m currently away from home with my MacBook.

Could Plex still be advertising the same external port for both servers, even though they’re now on separate networks? If so, could this be causing the secure connection issue I’m experiencing?

Thanks for your help, OttoKerner!