Cisco Bug: CSCzv91286 - Continue with A query even if we receive a SERVFAIL ...
Jun 15, 2017
- Cisco Email Security Appliance
Known Affected Releases
7.6.1-022 8.0.1-000 8.5.0-000
Symptom: 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." Conditions: 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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Bug Details Include
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- Known Fixed Releases
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