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Cisco Bug: CSCul68246 - ASA TCP Normalizer does not handle OOO TCP ACKs to the box

Last Modified

May 29, 2019

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

8.4 9.0 9.1

Description (partial) 

Symptom:
Bad retransmissions from the ASA (to the box traffic) those retransmissions are triggered by an OOO TCP ACK.

Conditions:
-- ASA configured with a TCP server (HTTPS, SSH, Telnet).
-- Client communicating with the ASA through a Device that is monitoring TCP retransmissions.
-- TCP ACKs are not delivered in order.
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