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After receiving a response from the DNS server ONTAP returns a Port unreachable ICMP error response

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Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

ONTAP 9

Issue

  • ONTAP are intermittently recording DNS timeout errors.

[?]  Wed Jan 29 09:01:24 +0900 [XXX: mgwd: dns.server.timed.out:error]: DNS server XXX did not respond to vserver = XXX within timeout interval.
[?]  Wed Jan 29 09:04:09 +0900 [XXX: mgwd: dns.server.timed.out:error]: DNS server XXX did not respond to vserver = XXX within timeout interval.
[?]  Wed Jan 29 09:05:55 +0900 [XXX: mgwd: dns.server.timed.out:error]: DNS server XXX did not respond to vserver = XXX within timeout interval.
[?]  Wed Jan 29 09:07:34 +0900 [XXX: mgwd: dns.server.timed.out:error]: DNS server XXX did not respond to vserver = XXX within timeout interval.

  • Despite no operational impact being reported.
  • Packet traces reveal that after receiving a response from the DNS server, an ICMP Port Unreachable error is sent back to the DNS server.

9508    229.057133    2025-02-13 07:38:53.487840    XXX    XXX    DNS    84    53    52273    Standard query response 0xd806 Server failure PTR XXX.in-addr.arpa
9509    229.057178    2025-02-13 07:38:53.487885    XXX    XXX    ICMP    112            Destination unreachable (Port unreachable)
9512    231.754400    2025-02-13 07:38:56.185107    XXX    XXX    DNS    84    53    32739    Standard query response 0xe614 Server failure PTR XXX.in-addr.arpa
9513    231.754444    2025-02-13 07:38:56.185151    XXX    XXX    ICMP    112            Destination unreachable (Port unreachable)
9543    239.948689    2025-02-13 07:39:04.379396    XXX    XXX    DNS    84    53    32355    Standard query response 0xe614 Server failure PTR XXX.in-addr.arpa
9544    239.948730    2025-02-13 07:39:04.379437    XXX    XXX    ICMP    112            Destination unreachable (Port unreachable)

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