OK so I ran thru all these different things and I could not find anything wrong.
In summary to your questions,
Have you previously configured your PMS for external access?
Yes before this failure and it had worked but then disconnected it for external access
Is it linked to your plex account?
Yes I have always had a plex pass
As in are you able to see your plex server from an Plex media player on a phone/tv/other pc or if you have Plex Pass can you see it online?
Answer is NO to all questions
(trying to narrow the issue down)
Open your freenas web ui > shell > type in jls
Is plexmediaserver running?
Yes it is running
If so are you being blocked by your modem/firewalls from the Plex port (32400)?
No don't think its being blocked - I can ping it and it replies - its also showing on my local network scanner
If connected, not being blocked... Freenas Web UI > Jails > Double click on your Plex Jail > check or un check the VIMAGE > Save > Restart the jail ... That is best set checked so test both checked and un checked (restarting between attempts) and see if you have any joy there..
tried it with it checked and unchecked - no difference.
When you check your the port at your modem, just ensure that you can see your plex IP address assigned in the modem "attached devices" section...
Yes I can see it
Also clear out your browser cache / use a different browser as your browser could potentially be blocking you
tried that - no joy
also... But you still should be able to see your PMS using another player whilst connected to your local network...
See how you go, got a fair bit to keep you busy!
If your to technical, I could offer to remote in and have a look for you if you wanted to install Team Viewer... But see how you go!
happy to let you have a go ! but the thing to remember here is I didn't change anything on my network except just run the latest update to the latest version - that's when it all stopped working - so I'm wondering if there is something in the build that I downloaded that killed it - to test that theory is it possible to do a 'downgrade' update and go back to the previous build ? If so I have no idea how to do that - thanks for your help - Mike