Remote access fail after 1 seconds on ds218+

Server Version#: DSM 6.2.3-25426 Update 2
Player Version#:1.19.4.2935

Hello,
I’m new in the NAS “community”, and therefore in Plex recently, but I still have good notions of networking thanks to my old courses ^^
Let me explain my problem… Plex works very well the local, the problem is that I tried to activate the remote access and the… No way…
Quickly, my nas is in fixed IP on my router (livebox -> french operator), I configured the dns to have a nice url, and opened the ports of the dms and some other apps on the router and everything is fine…
But, Plex, I allowed the firewall rules, opened port 32400 on the router (which I put in 32 401 externally), and I specified port 32401 on the plex server, but no way…
I confess I don’t really understand, if some of you have already had this problem with a livebox I’m willing to find a solution, and if you need more information don’t hesitate ^^ ^

When I activate the remote access, something weird happens, the access is activated and functional for a few seconds everything is green, then suddenly the error comes back.

Thank you very much!

The NAS is at my house, and Plex server is installed on it. So the port Forward is only done on Plex & my router, right?

Okay, I’ll try that on the way home, thanks for your answers. I’ll let you know.

Ok so I changed the access since the return as you asked me, since the NAT/PAT setting as you can see on the picture, and also on Plex, but still the same problem… https://prnt.sc/tmzxq8

Okay, here are the logs.Plex Media Server Logs_2020-07-23_07-20-48.zip (2.1 MB)

As a matter of fact, I updated it yesterday.
The modem is restarted and everything that goes with it, but no message in the parameters

Okay, I’ll call them and see what I can do, thanks for trying anyway.

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