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Cisco Bug: CSCsz27257 - Front End remains at zero window ,if SEG.LEN > 0 is rx'ed

Last Modified

Feb 03, 2017

Products (1)

  • Cisco ACE Application Control Engine Module

Known Affected Releases


Description (partial)

The ACE advertises a zero TCP window when terminating front-end SSL connections, and subsequently does not open the window after the underlying data is processed.

A client sending many small (single byte) SSL records to the ACE running front-end SSL termination may encounter a zero window advertisement from the ACE.  In some packet scenarios, the ACE does not open the TCP window even after the server acknowledges the payload.  Part of the scenario also involves the server advertising a zero window to the ACE in conjunction with the ACE advertising a zero window to the client.
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