icm/keep_alive_timeout is a SAP Parameter attribute which is used to control Keep alive timeout for inactive server connections information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
If, for the existing connection, there is no further communication
within the specified time period, the ICM terminates the connection. You
can set the default value for the timeout with this parameter, but it
can be overridden for each service (see below). The value -1 deactivates
the timeout. This means that the ICM never closes the connection.
Caution
After the timeout interval has expired, the user context in the work
process is not closed. This timeout is defined by the profile parameter
See SAP Parameter Documentation for full SAP documentation for this profile parameter.