Uploaded March 2024 | Updated September 2026, 2 weeks ago

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Cisco ASA TCP Connection Flags Explained

When you troubleshoot TCP connections through the Adaptive Security Appliance (ASA), the connection flags shown for each TCP connection provide a wealth of information about the state of TCP connections to the ASA. This information can be used to troubleshoot problems with the ASA, as well as problems elsewhere in the network.

Here is the output of the show conn protocol tcp command, which shows the state of all TCP connections through the ASA. These connections can also be seen with the show conn command.

To understand what the flags represent, you need to understand TCP handshaking and connections. If you understand this about TCP, then it is easy to interpret the state of the connection.

Cisco document link page:
cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/113602-ptn-113602.html










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#cisco#tcp#troubleshooting