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After migrating LIF, CIFS fails because firewall is blocking DNS

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Category:
ontap-9
Specialty:
NAS
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Applies to

  • ONTAP 9
  • CIFS/SMB
  • DNS
  • Firewall

Issue

  • When LIF1 is on Node1, CIFS clients can access files through \\LIF1
  • After migrating LIF1 to Node2
    • CIFS clients cannot access files through \\LIF1
    • cifs check fails due to lack of domain controller connectivity
  • EMS logs that secd cannot connect to domain controllers
    • [?]  Tue Dec 10 22:48:16 -0600 [Node2: secd: secd.conn.auth.failure:notice]: Vserver (SVM1) could not make a connection over the network to server (ip 10.222.44.22, port 389) via interface 10.222.11.111. Error: Operation timed out (Service: LDAP (Active Directory), Operation: SiteDiscovery).
    • [?]  Wed Dec 11 00:02:21 -0600 [Node2: secd: secd.conn.auth.failure:notice]: Vserver (SVM1) could not make a connection over the network to server (ip 10.222.44.22, port 445) via interface 10.222.11.111. Error: Operation timed out ().
  • EMS logs that on cannot connect to DNS
    • [?]  Tue Dec 10 19:02:05 -0600 [Node2: secd: secd.dns.srv.lookup.failed:error]: DNS server failed to look up service (_ldap._tcp.dc._msdcs.cii_encrypt/JBUoMK2QNFgN2xPC7pUcyTx0UhbekfSoyenbCQb5y3om4BnlETKxslSls82+DxFs/cii_encrypt) for vserver (SVM1) with error (Operation timed out).
  • Packet trace shows that when LIF1 sends a DNS query, no response is received

 

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