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Cisco Bug: CSCup17336 - Enable EDNS support for DNS queries from ESA

Last Modified

Mar 31, 2020

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

8.5.5-280

Description (partial)

Symptom:
DNS queries which has response larger than 512 bytes will be replied with TCP fallback mechanism.

Conditions:
DNS response larger than 512 bytes
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