Hello
If you have an older release of Java system then you need to configure the SLD settings in the Visual Admin.
http://help.sap.com/saphelp_nw70/helpdata/en/ee/74b3407e73c57fe10000000a1550b0/content.htm
http://help.sap.com/saphelp_nw70ehp1/helpdata/en/48/b6847d96655295e10000000a42189b/frameset.htm
For newer release I believe it is done from NWA
http://help.sap.com/saphelp_nwpi71/helpdata/en/c9/dc37520bdf4b48bb8f6d4329f073d5/content.htm
http://help.sap.com/saphelp_nwpi71/helpdata/en/ea/cd2e807e0e45bf9da67354f452fc05/content.htm
Please read this article for more information on SLD:
http://scn.sap.com/docs/DOC-8042
Regards
RB