Connection problems Synology Ds220+ and Plex

Server Version#: PlexMediaServer-1.40.2.8395
Player Version#:

Hey guys,

greetings to all !
Since several years i have my synology and plex running perfect. Since i few days, my plex cannot connect anymore to my synology ds 220+ server. I made all updates on my app, on my server, all synology software updates etc. But its still not working, when i log in my plex.tv account, it gives me the following error message:

app.plex.tv is unable to connect to “NAS123” securely
Its “Secure connections” setting may be set to disabled, or you may need to adjust some settings on your network. You can learn more about secure connections here.

Can anyone help me out please ? I dont know whats wrong, i tried to get it work for hours, but no luck. Can you guys help me please or give me a hint ?

Thank you so much and have a great day

DNS rebinding protection in your router/DNS resolver.
https://support.plex.tv/articles/206225077-how-to-use-secure-server-connections/

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