All browser clients are getting ERROR: "app.plex.tv is unable to connect to "linux-plex" securely"

Server Version#: latest from repo
Player Version#: latest chrome / edge
as of yesterday (2025-11-08), each browser client that tries to connect to server on local lan is getting this ‘error’

app.plex.tv is unable to connect to “linux-plex” securely

Its “Secure connections” setting may be set to disabled, or you may need to adjust some settings on your network. You can .

WHY?

Undo whatever you did.

Landis.

Oh… Not Plex, but the %$#! at chrome[ium]…

ANSWER HERE: (so easy, and i wouldn’t have found it myself, as i was Sure it was Plex. Thanks ‘PlexInfo’)
Landis.