I've got a Windows Core Server which was shut off for awhile. Unfortunately it appears to have lost the domain connection while off. Normally on a GUI Server or Workstation it's not a big deal, I would simply switch it to a workgroup, then switch back to the domain.
However, this Core install refuses to leave the domain to switch to a work group. I've tried the text menu tool. I've tried netdom from the cmd prompt. I've even tried the powershell commands. All of the above have been attempted with local admin as well as domain admin creds. "No mapping between account names and security IDs was done" is the error I get back from most of the tools.
What's special about Windows Core that it can't do this the way the GUI Windows would, and how do I work around/fix it?