Health state unavailable DomainTrustCheck failed

Hi Kat

I did however i Cant say for sure which it was but one thing was i could see some authentication issues and after some heavy googling it appeared there was remnants of an old SBS 

so there was an old SPN account that needed removing Domain controller level which is part of MSQLSVC, this was visible in the logs as a recurring authentication error, I cant give you more detail as i was just stumbling through one thing after another through Christmas trying to get to the bottom of it, but once i located the error then i googled how to delete an SPN

Just found a message I wrote to a colleague, basically you cant have duplicate/multiple SPN's or they can cause authentication issues so you locate the existing SPN's and delete the old one in my case one was labelled customerSBS.domain.local. I cant find the command i used to pull the list or delete them but im sure with this info if you google that you will find it.

Hope that helps