Windows 7 PC Removed From Domain With Crossed Credentials?

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Crammit

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Dec 2, 2007
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So I currently work on my cities helpdesk as a support tech. I was deploying a PC today and needed to create an account that did not require a password so I had to remove it from the domain because of GP. While doing so I unintentionally entered my domain username and local built-in administrator account password and it successfully removed the PC from the domain. Is this something that Windows intends to allow? I was baffled that it worked because simultaneously upon hitting enter I expected the error to occur but it successfully rejoined the WORKGROUP I entered. I thought maybe I had made a mistake so I asked a coworker to do the same thing on another PC right next to me and it too succeeded. Any thoughts or explanations?
 

TheShooter93

Malware Specialist
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Jul 9, 2008
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Cody
Hi Crammit,

I only have experience removing computer from a domain with domain admin credentials, not the local admin credentials. I'm not sure if the latter works.

That being said, if you used the username of the domain admin and the password for the local admin (assuming they are different), there should have been an error as the login wouldn't have authenticated.

Are you sure this is what you did? Or am I misunderstanding?
 

Crammit

Thread Starter
Joined
Dec 2, 2007
Messages
108
I am 100% positive this process successfully removed a PC from the domain with mixed credentials. I initially entered the wrong credentials (which succeeded) and then told my supervisor about it and had him do the same thing with his domain username/local admin pw and it still worked. Yes our passwords are different in regards to our domain credentials and the local admin. It was a mind blow but we had a good laugh about it lol
 

TheShooter93

Malware Specialist
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Cody
That...really shouldn't work. I'm very curious to try this at work this coming week.

Not saying I don't believe you -- I'm sure at this point that is what you're doing. I'm just curious to see if I can replicate it to see if it's normal behavior.
 
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