Cisco Bug: CSCtc69845 - Unexpected ACK is sent from ASA during multiple retransmission
Nov 08, 2016
- Cisco ASA 5500-X Series Firewalls
Known Affected Releases
Symptom: In case of Smart Tunnel WebVPN, ASA is an end point of WebVPN tunnel and the initiator of TCP connection with the target server. On the side of non-WebVPN TCP connection, and when ASA can't receive any acknowledge packets from server, ASA repeatedly sends not only retransmitting packet but unexpected ACK which has strange sequence/acknowledge number, which is minus 1 of the one of retransmitting packet. This unexpected ACK is sent from ASA every minute until the connection is closed. Conditions: This problem is found while ASA retransmits decrypted GET packets from Smart Tunnel client.
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Bug Details Include
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