After having some DNS forwarding issues with my internal dev domain and my external domain name, I decided to rename it from dev.bluey.com to dev.local.
Renaming an AD domain isn’t as big a deal as most people make it out to be. The rendom.exe command takes care of most everything for you. I did all the usual rendom /list, rendom /upload, rendom /prepare, and finally rendom /execute to actually kick off the domain rename.
I noticed after rebooting the DC, it hung for a very long time at “Applying Computer Settings…”. I had the same issue with my lappy after joining it to the new domain, it would hang at “Applying Computer Settings…” during boot. I kept seeing 1079 and 1006 errors in the event log. gpupdate.exe showed that my group policies were refusing to apply. dcdiag.exe spewed back more of the same. Out of desperation I tried reloading the gpo schema with dcgpofix.exe but still had the same issue.
In the end, I realized I forgot to actually FINISH the domain rename. A quick rendom /end, gpfixup, and rendom /clean and everything worked like magic again. So in case you’re dumb like me and forget to complete the rename, there ya go…