enabled

0 or 1 

Determines whether the keep-alive subsystem is enabled at runtime. The default value is true.

threads

0 or 1 

The number of keep-alive subsystem threads. The value can be from 1 to 128. The default value is 1. 

max-connections

0 or 1 

The maximum number of concurrent keep-alive connections that the server supports. The value can be from 1 to 1048576. The default value is 200. 

timeout

0 or 1 

The timeout (in seconds) after which an inactive keep-alive connection can be closed. The value can be from 0.001 to 3600. The default value is 30 seconds. 

poll-interval

0 or 1 

The interval (in seconds) between polls. The value can be from 0.001 to 1. The default value is .001.