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Windows DC reports event ID 3039 with "Try Channel Binding For AD LDAP Connections" enabled

Last Updated:

Applies to

  • ONTAP 9.x
  • CIFS


  • Starting ONTAP 9.10.1 support for channel-binding for AD-LDAP over TLS was introduced
  • Try Channel Binding For AD LDAP Connections is enabled by default.
cluster1::> cifs security show -vserver svm1

Vserver: svm1

                            Kerberos Clock Skew:                   - minutes
                            Kerberos Ticket Age:                   - hours
                           Kerberos Renewal Age:                   - days
                           Kerberos KDC Timeout:                   - seconds
                            Is Signing Required:                   -
                Is Password Complexity Required:                   -
           Use start_tls for AD LDAP connection:               false
                      Is AES Encryption Enabled:               false
                         LM Compatibility Level:  lm-ntlm-ntlmv2-krb
                     Is SMB Encryption Required:                   -
                        Client Session Security:                none
                SMB1 Enabled for DC Connections:               false
                SMB2 Enabled for DC Connections:      system-default
  LDAP Referral Enabled For AD LDAP connections:               false
               Use LDAPS for AD LDAP connection:                true
      Encryption is required for DC Connections:               false
   AES session key enabled for NetLogon channel:               false
    Try Channel Binding For AD LDAP Connections:                true


  • In this scenario, even with channel binding enabled, the Windows DC still reports event ID 3039:
The following client performed an LDAP bind over SSL/TLS and failed the LDAP channel binding token validation.

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