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Type: integer
Default: 0
Min: 0
Max: 2147483647
Unit: milliseconds (ms)
Context: user
Restart: false
Since: 12

Specifies the amount of time that transmitted data may remain unacknowledged before the TCP connection is forcibly closed. If this value is specified without units, it is taken as milliseconds. A value of 0 (the default) selects the operating system's default. This parameter is supported only on systems that support TCP_USER_TIMEOUT; on other systems, it must be zero. In sessions connected via a Unix-domain socket, this parameter is ignored and always reads as zero.

This parameter is not supported on Windows, and must be zero.

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