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Level 7

EMM 9.6 LDAP connection issues

Hello Folks

Customer at a certain point of the day are receiving ldap connectivity errors on Hub Server.

Windows System Log

The Security System could not establish a secured connection with the server ldap/ No authentication protocol was available

Soon after the following errors are generated in the Hub logs.

EMM Hub Log


IsLDAPServerAvailable - An error occurred while attempting to establish a connection to the domain.System.Runtime.InteropServices.COMException (0x8007052E): Logon failure: unknown user name or bad password.”


Failed to authenticate user: sa-mdmtestSystem.Runtime.InteropServices.COMException (0x8007052E): Logon failure: unknown user name or bad password.

   at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)

   at System.DirectoryServices.DirectoryEntry.Bind()

   at System.DirectoryServices.DirectoryEntry.get_Name()

   at EMM.Security.DirectoryServer.GetLDAPDetails(UserEntity& user)

Some but not all user devices become non-compliant. The user needs to perform an update configuration. We think the system is being redirected to another Domain Controller.  Has anyone seen this behaviour before?

The release notes state:

  • DE1989: Auth directory only tries the first domain controller it finds in DNS

Workaround: Please refer to KB:

Does anyone know the what the Workaround is? I can’t find the KB for it.



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