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IMAP clients that use NTLM authentication protocol are continually prompted for credentials in Exchange Server 2013

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Symptoms

Assume that you have a Microsoft Exchange Client Access server that establishes sessions to a different Mailbox server in an Exchange Server 2013 environment. After you apply cumulative update 9 or cumulative update 10 for Exchange Server 2013, Internet Mail Access Protocol (IMAP) clients are repeatedly prompted for authentication credentials. 

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Cause

This is a known issue in Exchange Server 2013.

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Workaround

To work around this issue, follow these steps to restart your IMAP services on the Exchange Server 2013 server:
  1. Disable the EnableGSSAPIAndNTLMAuth parameter.
  2. Run the Set-IMAPSettings -EnableGSSAPIAndNTLMAuth $false cmdlet.

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Resolution

To fix this issue, install Cumulative Update 11 or a later cumulative update for Exchange Server 2013.

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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 : 3076376
Revision : 1
Created on : 1/7/2017
Published on : 2/12/2016
Exists online : False
Views : 263