It appears that the server component of the software has died. In short
going to localhost:32400 works
going to plex.tv clicking launch works on the localhost.
As per the attached picture. In Server / General it says:
Version 1.9.2.4285 Something went wrong. Please install manually.
The link it takes you to is the full system software download.
I have downloaded Plex-Media-Server-1.9.2.4285-9f65b88ae a couple of times and tried both the repair option and the uninstall/reinstall option. To me it appears to be this one issue, does anyone have a suggestion?
Connecting via the launch button on plex.tv works on the local machine
Connecting via [IP]:32400/web/index.html does not work, even on the local machine.
The ps4 or phone/tablet cannot connect via either the app or the web browser.
I have followed you above instructions and the error message has gone. Although nothing can connect at this stage. Time to nuke windows and go with a reinstall?