Cisco Bug: CSCuq41530 - Access to websites fails if initial SYN/ACK has 0 window size
Last Modified
Nov 27, 2020
Products (1)
- Cisco IronPort Web Security Appliance Software
Known Affected Releases
7.7.0-608 7.7.0-753 8.0.5-075 8.0.6-078
Description (partial)
Symptom: Access to certain websites will fail while going through the WSA. Packet capture would show that WSA receives a SYN/ACK from server with "0" window size followed a TCP Keep-alive with non-zero window size Conditions: The issue would only happen for websites which initlally respond with a "0" window size in SYN/ACK, followed by a TCP Keep-alive with non-zero window size
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Bug Details Include
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