Microsoft KB Archive Search

Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

  1. Home
  2. "An Active Directory error 0x51 occurred" error when you run the "Setup /PrepareAD" command from a DC in Exchange 2013

"An Active Directory error 0x51 occurred" error when you run the "Setup /PrepareAD" command from a DC in Exchange 2013

View products that this article applies to.

Symptoms

This issue occurs in a domain that has no global catalog servers. This issue occurs after you apply Cumulative Update 5 or a later version of cumulative update for Microsoft Exchange Server 2013 (Cumulative Update 6 or Cumulative Update 7). When this issue occurs, you receive the following error messages:
[Time_Point_1] [2] [ERROR] An Active Directory error 0x51 occurred when trying to check the suitability of server 'domain_controller_name'. Error: 'Active directory response: The LDAP server is unavailable.'

[Time_Point_2] [2] [ERROR] The LDAP server is unavailable.

Note This issue will not occur if you upgrade the domain controller (DC) to a global catalog.

↑ Back to the top

Cause

This issue occurs because of a change that introduces DC stickiness for writable sessions into Cumulative Update 5 for Exchange Server 2013.

↑ Back to the top

Resolution

To resolve this issue, install Cumulative Update 8 for Exchange Server 2013.

↑ Back to the top

Keywords: kbqfe, kbfix, kbsurveynew, kbexpertiseinter, kb

↑ Back to the top

Article Info
Article ID : 2986941
Revision : 1
Created on : 1/7/2017
Published on : 3/17/2015
Exists online : False
Views : 366