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Fordsfords (talk | contribs) Added section explaining that a stateful firewall can lead to half-open connections. |
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{{unreferenced|date=May 2017}}
The term '''half-open''' refers to [[Transmission Control Protocol|TCP]] connections whose state is out of synchronization between the two communicating hosts, possibly due to a crash of one side. A connection which is in the process of being established is also known as '''embryonic connection'''. The lack of synchronization could be due to [[SYN flood|malicious intent]].
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* [[SYN cookies]]
* [[Stateful firewall]]
== References ==
{{refbegin}}
*Twingate. (n.d.). ''What is a TCP Half Open Scan?''. Retrieved May 2, 2025, from [https://www.twingate.com/blog/glossary/tcp-half-open-scan](https://www.twingate.com/blog/glossary/tcp-half-open-scan)
*Palo Alto Networks. (n.d.). ''TCP Half Closed and TCP Time Wait Timers''. Retrieved May 2, 2025, from [https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-networking-admin/session-settings-and-timeouts/tcp/tcp-half-closed-and-tcp-time-wait-timers](https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-networking-admin/session-settings-and-timeouts/tcp/tcp-half-closed-and-tcp-time-wait-timers)
*Sanchit Gurukul. (n.d.). ''Understanding TCP Half-Open Connections''. Retrieved May 2, 2025, from [https://sanchitgurukul.com/understanding-tcp-half-open-connections](https://sanchitgurukul.com/understanding-tcp-half-open-connections)
[[Category:Transmission Control Protocol|Half-Open]]▼
{{refend}}
== External links ==
* [http://www.ietf.org/rfc/rfc0793.txt Transmission Control Protocol DARPA Internet Program Protocol Specification]
▲[[Category:Transmission Control Protocol|Half-Open]]
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