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Cisco Bug: CSCvv54911 - DANE TLSA failures can cause application faults.

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

13.5.1-277

Description (partial)

Symptom:
If a destination is set to enable DANE support, but the ESA cannot resolve its TLSA resource record, the following application fault can be generated:

An application fault occurred: ('egg/smtp_client.py start_dane|2172', "<class 'dns_exceptions.DNS_Soft_Error'>", 'DNS Soft Error looking up _25._tcp.mxin1.*******.*** (TLSA) while asking recursive_nameserver0.parent. Error was: unable to reach nameserver on any valid IP', '[egg/smtp_client.py _connect_to_ip|1218] [egg/smtp_client.py start_dane|2172]') ip:***.***.***.***

Conditions:
A destination that is set to enforce DANE support that has a TLSA RR that the ESA cannot resolve.
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