If WordPress Permalink shows blankpage, do below
[root@server1 ~]# vi /wp-admin/includes/misc.php and change the line as indicated below
Search for function got_mod_rewrite
and replace below like in it .
$got_rewrite = apache_mod_loaded(‘mod_rewrite’, true); //old line with false negative;
$got_rewrite = true;//force the response to true as we know mod_rewite is installed