I try set my custom permalink structure on my wordpress website but it redirects me to 404 error page when I try to enter posts... There seem to be some problems with my apache configuration but I can't guess exactly what. I'm using VPS hosting on linux server, centos. When I was on shared hosting everything worked fine. My .htaccess file isn't writable so I paste this code manually as wordpress asked but it didn't help. Can anyone please tell what is the problem? Thanks in advance