Plex Issue - Unable to connect to "My Cloud Home" securely

im also having this problem
very annoying
I think my WD is in the newest ver. and the Plex also
I cannot access to the server setting of Plex (altho on tv I can watch anything as normal)

Wd is on ver. 7.15.1-101
Plex server is unreachable so I don’t know what version is.