Windows 7 Trust Relationship Failed (unjoin domain)

I had a IT Admin had been trying to login to a Windows 7 desktop that had not been fail to login due to reinstall new domain server. I kept getting a message when trying to logon that said “the trust relationship between this workstation and primary domain failed”. When trying to login as the local Administrator account, it said that the account was disabled.

By default, Windows 7 disables the local Administrator account. The desktop was encrypted, so resetting any passwords by means of a third party password recovery disk could cause the data to be irretrievable.

After some research, I(admin) found that I can boot the system with the network cable unplugged and login (as admin) with cached network credentials. After that I can unjoin the domain and restart the pc. The admin was able rejoin domain again and every teachers can be login after plug in the network cable. After a reboot, the PC could login to the domain normally.

source:
http://www.conetrix.com/Blog/post/Windows-7-Trust-Relationship-Failed.aspx

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