I built a test server running RHEL6 with Apache installed. WordPress installed without an error. With the default Permalink settings I am able to access all of the web pages generated by WP. When I change Permalinks to Post Name then Save changed I see that WP is modifying my .htaccess file but I get an Error 404 when trying to access any of my posts. mod_rewrite is enabled in Apache. I have tried different remedies specified in the WP Forums but none of them has fixed the problem.