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Operations using Secure LDAP fail, due to (enforced) ChannelBinding

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ontap-9
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Applies to

  • ONTAP 9
  • Microsoft LDAP server
  • Secure LDAP
  • LDAPS
  • Start-TLS

Issue

  • Operations which require an LDAP connection between ONTAP and the MS LDAP Server (AD site discovery for instance) fail.
  • Changing ACL on a file (error message on Windows client side)
    cannot determine whether the computer is joined to a domain
  • Enabling LDAP client on port 636 with vserver services name-service ldap client modify fails
  • LDAP server requires a user bind parameter to be set [-bind-dn <ldap_dn>] - Bind DN (User)

  • In the EMS and SECD logs Invalid credentials, which seem to be related to the failure when initiating the secure LDAP connection.

EMS:

secd: secd.conn.auth.failure:notice]: Vserver (<vserver>) could not authenticate over the network to server (). Error: Invalid credentials (Service: LDAP (Active Directory), Operation: SiteDiscovery).
  • Depending on whether LDAPS or START-TLS is used, it will manifest itself in the SECD logs slightly different.
SECD (LDAPS for AD LDAP connection)
 
00000013.007e944b 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] Failure Summary:
00000013.007e944c 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] Error: User authentication procedure failed
00000013.007e944d 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] CIFS SMB2 Share mapping - Client Ip = 1.2.3.4
00000013.007e944e 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] ...
00000013.007e944f 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] [ 9988] Successfully connected to ip 1.2.3.51, port 636 using TCP
00000013.007e9450 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] [ 10202] Unable to start LDAPS: Invalid credentials
00000013.007e9451 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] [ 10202] Additional info: 80090346: LdapErr: DSID-0C090588, comment: AcceptSecurityContext error, data 80090346, v2580
00000013.007e9452 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] [ 10202] Unable to connect to LDAP (Active Directory) service on <server.domain> (Error: Invalid credentials)
up.
 
SECD (START-TLS for AD LDAP connection)
 
00000013.007e944b 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] Failure Summary:
00000013.007e944c 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] Error: User authentication procedure failed
00000013.007e944d 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] CIFS SMB2 Share mapping - Client Ip = 1.2.3.4
00000013.007e944e 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] ...
00000013.007e944f 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] [ 9988] Successfully connected to ip 1.2.3.51, port 389 using TCP
00000013.007e9450 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] [ 10202] Unable to start LDAPS: Invalid credentials
00000013.007e9452 0fc9a7d2 Mon Nov 02 2020 06:14:14 +01:00 [kern_secd:info:8211] [ 10202] Unable to connect to LDAP (Active Directory) service on <server.domain> (Error: Invalid credentials)

 

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