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Cisco Bug: CSCzv91286 - Continue with A query even if we receive a SERVFAIL ...

Last Modified

Jun 15, 2017

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

7.6.1-022 8.0.1-000 8.5.0-000

Description (partial)

Emails are not delivered to certain reachable destinations. The log messages for these transactions contain the following error message: "DNS Soft Errors, unable to reach nameserver on any valid IP."

This symptom is observed when:
1. The appliance is configured with both IPv4 and IPv6 addresses.
2. Destination options are set to prefer IPv4 records.
3. Destination hostname does not resolve to an IPv6 address.
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