NOT DIRECT access to the server!?!?! in the local network

Hello everyone, as per object today I have “migrated” from the old fiber to the 1gb / s one by Fastweb. Everything goes as before except for plex that when accessing it indicated that my access was no longer direct to the server. Too bad that the server itself is my pc and as always I access it from the browser. I have also updated to the latest version available but nothing still gives me indirect access with the consequent decrease in image quality. I do not understand being the PC connected in LAN I did not have to do anything and the other programs work quietly.

Thanks to anyone who can help me solve.

Marco

Did you exchange your router to achieve this? Or did your router get a new firmware from your ISP?

It might have to do with https://support.plex.tv/articles/206225077-how-to-use-secure-server-connections#toc-4