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3rd party firewall on Active Directory is blocking  ports 389 and 445

Last Updated:

Applies to

  • ONTAP 9


  • When attempting to reach out to Active Directory (AD), AD closes the connection when attempting to connect to ports 389 or 445.
  • This can be seen via TCPDUMP:
  • We also can see this in secd/ems logs:

[Node1: secd: secd.conn.auth.failure:debug]: Vserver (svm1) could not make a connection over the network to server (ip, port 445). Error: Operation timed out ().
[Node1: secd: secd.lsa.noServers:debug]: None of the LSA servers configured for Vserver (svm1) are currently accessible via the network.


[Cluster01-01: secd: secd.cifsAuth.problem:error]: vserver (SVM1) General CIFS authentication problem. Error: User authentication procedure failed CIFS SMB2 Share mapping - Client Ip =
[ 0 ms] Login attempt by domain user 'NetApp\bob' using NTLMv2 style security
[ 0] Using a cached connection to
[ 26] Authentication failed with DC DC1. Not retriable. (Status: 0xc0000064)
[ 27] Unable to find the NetBIOS domain name for Active Directory '.' **
[ 27] FAILURE: CIFS authentication failed
[ 2125] TCP connection to ip, port 389 via interface failed: Operation timed out.
[ 4159] Unable to connect to LDAP (Active Directory) service on (Error: Can't contact LDAP server
  [  8007] TCP connection to ip, port 445 via interface failed: Operation timed out.
  [  8007] Could not open a socket to ''
  [  8007] Unable to connect to NetLogon service on (Error: RESULT_ERROR_SPINCLIENT_UNABLE_TO_RESOLVE_SERVER)
**[  8007] FAILURE: Unable to make a connection (NetLogon:netapp.CN), result: 6942
  [  8007] CIFS authentication failed
  [  8007] Retry requested, but the retry window (7000 ms) has expired; giving up.


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