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Cisco Bug: CSCzv05640 - dnshostpref and destconfig DNS preference aren't working as expected

Last Modified

Feb 17, 2018

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

7.6.0-444 7.6.2-000 7.8.0-000 8.0.0-000

Description (partial)

Symptom:
Customer will see destinations that are listed as down when issuing the "tophosts" command and will see the following error when issuing the "hoststatus" command:
Multiple DNS queries were attempted and failed: DNS Soft Error looking up <hostname> (AAAA) while asking recursive_nameserver0.parent. Error was: unable to reach nameserver on any valid IP

Conditions:
Customer has a dual stack network (synchronous IPv4 and IPv6 networks) and sends to domains that have both IPv4 and IPv6
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