I've had an issue with Plex for the past month or so, and I thought it was something I had done wrong, and now I'm not so sure as historically I've been using Plex without issues for some time now.
The first warning flag was that one day my Xbox One app started giving me the "No Servers Found: server version 0.9.10.3 or higher version required" error. To be sure, I grabbed the latest Intel build for Synology (I have the DS1512+) from plex.tv and installed that (image attached showing the version of the server installed).
I removed all authed devices, blew away my cookies and localStorage, and started again from scratch. Whether I'm in an incognito window or not, I get the same error every time. Also, side not, not a huge fan of having my password sent around in the clear, even if it is on my local network.
Oddly, even the remote access section of the settings shows the port available locally but not externally. However, canyouseeme.org would prove otherwise: that port is definitely open.
At this point, I'm stuck. It seems like there's an error with the application itself, and since I don't have source code, I can't really debug this further. Help?