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Cisco Bug: CSCtd73569 - Incorrect MSS in connection record after syn-cookie is engaged

Last Modified

Feb 21, 2010

Products (1)

  • Cisco ACE 4700 Series Application Control Engine Appliances

Known Affected Releases


Description (partial)

ACE may inconsistently drop packets from the server for normalization purposes due to the MSS being exceeded. The inconsistency lies in the threshold of the size of the packet being dropped. This is dependent on whether the connection is proxied or unproxied in the ACE.

The MTU is configured for the interface and is smaller than the actual MSS of the server and the connection is an L7 connection.
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