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Cisco Bug: CSCtd19411 - cut-through proxy in transparent sends invalid ACK before SYN-ACK

Last Modified

Feb 22, 2014

Products (1)

  • Cisco Catalyst 6500 Series Firewall Services Module

Known Affected Releases


Description (partial)


cut-through proxy / network authentication fails on FWSM 4.0.x in transparent mode. 


a tcp-state checking device like an ASA or another FWSM needs to be between the FWSM context handling the cut-through proxy and the client.

client ---- ASA --- FWSM (transparent mode/cut through proxy) --- cloud
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