The application provides the user name "None" to MWG during the authentication process. When MWG tries to authenticate the "None" user with the domain controller, the domain controller takes five (5) seconds to reply with a user does not exist message (STATUS_NO_SUCH_USER).

 

Because of this five-second delay, pending authentication requests from other clients start to back up in the authentication queue on MWG. This delay and backup of requests results in other clients getting authentication prompts because their authentication request was not able to be processed. Specifically, it could not be processed within the configured "Authentication Attempt timeout" value in the MWG NTLM engine settings container.