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[ScreenOS/SRX] Information about the Half-closed timeout feature

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Article ID: KB26912 KB Last Updated: 26 Jun 2020Version: 2.0
Summary:

This article provides information about the half-closed feature and if it is supported on ScreenOS and SRX platforms.

Symptoms:
  • TCP, when established, is a bi-directional pipe.

  • A half-closed connection is when the client (or server) sends a FIN and the server (or client) ACKs the FIN, without sending a FIN itself. The timer starts, when this condition is met.

  • Some other devices have the ability to define a half-closed timeout, independent of the TCP timeout.

  • Is this ability also supported on ScreenOS and SRX firewalls?

Solution:

ScreenOS and SRX based security devices do not support this feature. When a half-closed condition occurs, the side that has the connection open will use the default TCP timeout that is set on the device.

Modification History:
2020-06-26: Article reviewed for accuracy. Article is correct and complete.
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