Monitoring the SAP Web Dispatcher 

Purpose

You can monitor the SAP Web Dispatcher from the browser or from the command line program icmon. With the browser use the Web-based interface to administrate and monitor the SAP Web Dispatcher.

The functions and structure are similar to transaction SMICM for the ICM in ABAP Web AS (see Monitoring the ICM with the ICM Monitor).

You cannot use transaction SMICM to administrate the Web dispatcher because the Web dispatcher is an infrastructure component usually in the DMZ and cannot be accessed from the Web AS.

Prerequisites

The following prerequisites must be satisfied to administrate the Web dispatcher from the browser.

·        You have installed the latest SAP Web dispatcher in a directory (see Operating the SAP Web Dispatcher).

·        You have unpacked packet icmadmin.SAR into a separate directory.

·        The value icm/HTTP/admin_<xx> is defined in the profile of the SAP Web Dispatcher.

·        You have a file for the authorization of administrators (icmauth.txt). When you start the Web dispatchers with ‑bootstrap this file is automatically created.

Installation and Configuration of the Web Administration Interface Oberfläche explains what you have to do to meet the prerequisites.

Alternatively you can monitor the SAP Web Dispatcher with the command line program icmon. The is described in Monitoring the SAP Web Dispatcher Using the Console. The profile file of the Web dispatcher must not be changed.

Administration with icmon can be done only on the same host on which the Web dispatcher is running.

Process Flow

You send an administration request to the SAP Web dispatcher from the browser, by entering the URL http://webdisp_host:admin_port/sap/admin. Processing Administration Requests describes how the SAP Web dispatcher identifies requests and generates responses.

For security reasons you should use HTTPS for the administration. If you use HTTP the administrator passwords are transferred unencrypted and can therefore be listened to. The Web dispatcher must be configured so that HTTPS is scheduled (see SAP Web Dispatcher and SSL).

When you have logged on you will see the administration and monitoring interface.

Most of these links are to monitoring functions.

On the left is the menu for the individual areas, on the right is the detail area.

The menu on the left is divided into the core system and the dispatching module:

The core system contains the kernel of the SAP Web Dispatcher: the runtime environment and the infrastructure, which the Internet Communication Manager (ICM) also uses.

This submenu contains the following areas:

Core System

Area	Function
Monitor	Overview of the existing threads
Active Services	Monitors, starts, deactivates services (ports)
Trace	Displays, resets, downloads trace file. Sets trace level
Parameter	Displays standard parameter values.
Host Name Buffer	Displays buffer values, resets buffer.
Release Information	Displays release notes
Statistics	Queries statistics
MPI Status	Displays status of MPI communication buffer.
ICM Security Log	Security log settings, log file display (see icm/security_log)
HTTP Access Log	Displays parameters and protocol file.
HTTP Server Cache	Displays parameters and cache entries.
User Administration	Creates, changes, and deletes administration users and passwords

For details see Monitoring the ICM with the ICM Monitor.

The dispatching module is part of the SAP Web dispatcher, which implements the selection of the application server depending on protocol, configuration, load balancing procedure, and so on. 

Dispatching Module

Area	Function
Monitor Server Groups	Displays current server groups for ABAP, J2EE. Displays response times, availability of servers (see Server Selection and Load Balancing Using SAP Web Dispatcher) Here you can also deactivate and reactive the application server here. Inactive servers do not get any requests from the Web dispatcher.
SSL End To End Dispatching	Displays parameters and entries in the client IP table (see End-to-End SSL)
URL Mapping	Displays the URL mapping table (see Architecture and Functions of the SAP Web Dispatcher)
URL Filter	URL filter settings (see SAP Web Dispatcher ass URL Filter)
Parameters	Displays parameters specific to the Web dispatcher (see Profile Parameters of the SAP Web Dispatcher).