[mdt] MDT not joining domain

[caffrey]

I've had MDT running for ages, been faultless. I deployed the image as I usually do today and all of a sudden it's not joining the domain any more - I've made no changes whatsoever. Any ideas what can be causing this behaviour ?

 

Actually I've just fixed this, I'm posting incase anyone else runs into a similar issue, turns out the account that allows joining the domain ( in the rules) password had expired - not immediately obvious!