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SMTP connection fails when you log on with a child domain account and use NTLM authentication in Exchange Server 2013

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Symptoms

When your UserPrincipalName (UPN) property references a child domain of the forest's fully qualified domain name (FQDN), the NT LAN Manager (NTLM) authentication fails in a Simple Mail Transfer Protocol (SMTP) session in a Microsoft Exchange Server 2013 environment.

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Cause

This issue occurs because of a bug in the code that causes the UPN of the user in a child domain of the forest to not match the FQDN of the forest during the NTLM authentication process.

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Resolution

To resolve this issue, install Cumulative Update 9 for Exchange Server 2013.

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Workaround

To work around this issue, change the UPN of the user to match the FQDN of the forest.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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Keywords: kbqfe, kbsurveynew, kbfix, kbexpertiseinter, kb

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Article Info
Article ID : 3056413
Revision : 1
Created on : 1/7/2017
Published on : 6/16/2015
Exists online : False
Views : 285