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Cisco Bug: CSCzv44813 - Appfaults are generated when open a lot of connections to invalid d...

Last Modified

Feb 28, 2020

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

13.5.0-241 7.6.1-022 7.8.0-117 8.0.0-000

Description (partial)

Symptom:
The Cisco Email Security Appliance (ESA) has an invalid DNS server address configured. This invalid DNS server accepts the DNS request but does not
respond. The ESA can generate application faults when many DNS resolutions to the not responding DNS server are in process. If there is a second DNS 
server configured the DNS requests should be resolved by that DNS server but are not.

Conditions:
The ESA is configured with a DNS server which does not respond.

Related Community Discussions

Ironport WSA reached maximum failures querying DNS server
I have been seeing an increased number of critical alerts on my Ironport indicating that it has reached the maximum number of failures querying the DNS server.  Has anyone seen this alerts before and/or know what causes them? I have not been able to find any information on the alert.   Thanks
Latest activity: Feb 01, 2016
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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