Suddenly unable to connect to TrueNAS via Windows explorer

Thanks - I left out the \\ at the beginning but I still have issues:

  1. I get a box asking for a user name and password but access is refused with the message that my organisation’s security policies block unauthorised guest access despite me entering the correct (and only) normal user which is listed in the users list I can see under account on TrueNAS UI page in my browser.
  2. I got out and old laptop and clicking TrueNAS in the network area does list all the shares and I can see all the files but with read only access. If I try and move or edit a file it says I need permission from unix user \Lorne which is the listed user name I have in the users list (other users are Plex and root).
  3. I tried using my root credentials that allow me in from the browser but that failed as well.

I have uploaded some screenshots here: Attachments