Cross domain authentication causing 0xC0000064

Occasional Visitor

Dear All,


I am trying to understand what are the factors that would cause event id 4776 to be logged with 0xC0000064 error code.


The scenario is, several domain accounts say for example, accounts in child domain is trying to authenticate through but the DC in keeps the attempts failed indicating "User name does not exist". 


May I ask you to assist with info on how the authentication is expected to take place from one child domain to another child domain? Is it possible? If yes, how it works? More details would very helpful.


If this is possible, what are the probable reasons behind a DC to be generating failure events with error code "User name does not exist".  What could be done to fix these problems?


Thanks for your support in advance.


The DC is running Win 2012 R2 standard




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