Thank you for your quick reply. I need to apply for whole server. ( For all domains ) Please let me know.
Edit /usr/local/apache/conf/httpd.conf and look for the following directive:
Options ExecCGI FollowSymLinks Includes IncludesNOEXEC Indexes -MultiViews SymLinksIfOwnerMatch
Change Indexes to -Indexes and then restart Apache. If Indexes are not present then you can add -Indexes instead. The directive will probably look a little bit different then what I have above but the <Directory "/"> line should still be there to help you find the right section.