Hi Shankar
There is a description of how to do it here:
http://help.sap.com/saphelp_46c/helpdata/en/c4/3a64b4505211d189550000e829fbbd/frameset.htm
Basically with transaction SMLG you define a group, and configure on each one of your application servers this group.
Besides on the client side your users have to make a new entry indicating this group instead of the application server.
Regards
Jose Luis Valverde
Add a comment