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Volatile Environment registry value LOGONSERVER causing authentication issues when one DC is off line

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Recently, I needed to shutdown one of our domain controllers.  At the end of the day I logged out of the network.  Next day I started my computer and logged in, but when my logon script tried to execute it froze and eventually timed out.  After reviewing my system I noticed that the LOGONSERVER environment variable was pointing to the server I took off line the day before.  Our network logon scripts are bat files and use the LOGONSERVER variable throughout.  I tried many times to reset that variable until I finally found it in the "Volatile Environment" registry key.  Once I changed it to the DC that is accessible, I was able to successfully log on and run my script.  I realize it's not often that a DC would be offline, but I would think this variable should auto update whenever a user gets a response back from the DC that answers the call for authentication.  I must have something configured incorrectly but I don't know where to go to fix this.  Can you please point me in the right direction?  Thank you.


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