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Procedure documentationUsing Signals to Control the ICM / Web Dispatcher Locate this document in the navigation structure


You can send operating system signals to the ICM and the SAP Web Dispatcher in order to execute functions. This is useful if you want to administrate the ICM or the Web Dispatcher from a shell script. The functions are provided in the ICM monitor (for the ICM) or the Web admin interface (ICM and Web Dispatcher).

For more information, see:

Using the ICM Monitor

Using the Web Administration Interface


The following table lists the signals and their effect on the ICM / Web Dispatcher.

Signals and Their Actions






Reduces trace level


Increases trace level


Buffers are invalidated: Host name buffer and server cache

The Web Dispatcher updates its configuration of active servers, details of groups, and URL prefixes. Either it gets the information from the message server or from a local file.

You can do the same from the context menu in the Web Administration Interface.

SIGHUP is not supported under Windows.

Caution Caution

These signals are valid on UNIX platforms only. Under Windows you can use sapntkill to send signals INT, USR1, USR2 to processes.

End of the caution.