Can you anyone tell me the use of webdispatcher in portal?
what is web dispatcher ? and advantages ?
You can also refer to SAP NOTE 538405..
SAP Web Dispatcher:-
The SAP Web dispatcher lies between the Internet and your SAP System. It is the entry point for HTTP(s) requests into your system, which consists of one or more Web application servers. As a "software web switch", the SAP Web dispatcher can reject or accept connections. When it accepts a connection, it balances the load to ensure an even distribution across the servers.
You can use the SAP Web dispatcher in ABAP/Java systems and in pure Java systems, as well as in pure ABAP systems.
It is also beneficial to use the SAP Web dispatcher, if you do not need security functions (entry point in the DMZ, SSL, URL filtering), but you simply want to balance the load between several SAP Web AS instances.
The SAP Web dispatcher is a program that you can run on the machine that is connected directly to the Internet. It requires minimal configuration - you just have to enter the following data in the profile file:
a) Port, on which the HTTP(s) requests are to be received (parameter icm/server_port_<xx>).
b) Host and HTTP port of the SAP message server (parameter rdisp/mshost and parameter ms/http_port.
Hope this will be help full.