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Adding a vCenter Single Sign On Active Directory Identity Source fails with the LDAP error: The server requires binds to turn on integrity checking (2035934)

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  • Cannot add a vCenter Single Sign On (SSO) Active Directory Identity Source
  • Adding an Active Directory Single Sign On Identity Source with a Primary Server URL starting with ldap:// or ldaps:// fails
  • Test Connection fails with one of these errors:

    • [LDAP: error code 8 - 00002028: LdapErr: DSID-0C0901FC, comment: The server requires binds to turn on integrity checking if SSL\TLS are not already active on the connection, data 0, v1db1]

    • simple bind failed


This issue occurs if the Active Directory Domain is configured with a Group Policy that requires all LDAP connections to be secured with SSL (ldaps required) and the Domain controller: LDAP server signing requirements policy is set to Require signing.

A certificate that establishes trust for the LDAPS endpoint of the Active Directory server is required when you use ldaps:// in the primary or secondary LDAP URL.


To resolve this issue:
  1. Log in to the vSphere Web Client using the Admin@System-Domain credentials.
  2. Browse to Administration > Sign-On and Discovery > Configuration in the vSphere Web Client.
  3. Open the Edit Identity Source by right-clicking on the dialog of the Identity Source you want to edit.
  4. Change the URL from ldap://... to ldaps://....
  5. Click Choose Certificate.
  6. Select the correct .cer Root CA certificate of your AD/OpenLdap Identity Source.
  7. Click Test Connection.
  8. Click OK.
For more information on using a LDAPS Identity Source with vCenter Single Sign-On, see Configuring a vCenter Single Sign-On 5.1 Identity Source using LDAP with SSL (LDAPS) (2041378).

Additional Information

To Configure an Active Directory Domain for LDAP over SSL (LDAPS), see the Microsoft TechNet article LDAP over SSL (LDAPS) Certificate.

To obtain the trust certificate for use with SSO, see the Exporting the LDAPS Certificate and Importing for use with AD DS section of LDAP over SSL (LDAPS) Certificate.

Note: The preceding links were correct as of November 21, 2012. If you find a link is broken, provide feedback and a VMware employee will update the link.

See Also

Update History

11/26/2013 - Added link to 2041378

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