“Windows cannot verify that the user name is unique because the following error occured while contacting the global catalog”

Following is the few ideas for the below:-

1) Make sure the time and time zone are set correctly and
are in sync with each other on the two DCs.

2) Go in to AD Sites and services and make sure there
is a functional replication path established between the two
DCs if they are in different sites. You probably want to make
both DCs global catalog servers, but I don’t recommend that
you make any change like that at this time as it might make
your problem harder to figure out.

3) Run a netdiag /fix and a dcdiag /fix on both servers
(if these are not already on your servers then you can install them
from the \tools folder on the CD.) If a second pass of a /fix
is not reasonably clean, then something is wrong in
the AD configuration, and the log from these also will help figure
out your problem.

Hope this is very useful for you. 

Regards,

Kuntal. 

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One Response to “Windows cannot verify that the user name is unique because the following error occured while contacting the global catalog”

  1. Bonnie Says:

    thanks! Gave me a good start!


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