Custom permalink doesn't work

[levani]

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

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

as wordpress asked but it didn't help. Can anyone please tell what is the problem?

Thanks in advance

[Inigoesdr]

So, did you edit the .htaccess file? You say it's not writable, so I want to make sure you made the change.