Unable to bind to Windows Server 2012 R2

Article #: Product Castle
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You are attempting to bind the Authentication service to a Windows 2012 R2 Active Directory and the bind is failing


This is a known issue resulting from changes Microsoft have made to Server Security.


To resolve this issue, you will need to make some changes to Server Security settings as follows:

  1. Log on to the domain controller
  2. Open Administrative tools > Local Security Policy
  3. Go to Local Policies > Security Options
  4. Change "Network security: LAN manager authentication Level" to "Send LM & NTLM - use NTLMv2 session security if negotiated"
  5. Apply these changes
  6. Reboot the domain controller

If the above doesn't work, please run the following cmdlet under powershell:

Set-SmbServerConfiguration -EnableSMB1Protocol $true


Last updated: Author: Contributions by:
23 August 2016   DMT