I installed Drupal on my VPS, but it seems that all input on website doesn't work from web interface. What I mean by that:
I cannot login by using web interface
I CAN login by using one-time login link generated by Drush, but then strange things happen, I guess consequences of not working input - like Admin Menu disappears after refresh, and editing any content is impossible, after sending change - the edit page simply refresh with old values,
I have Redmine installed on this server and it works ok, so it seems to be Drupal specific.
The problem doesn't exist with "?q=/user/login" - it exists only with rewritten links. I'm pretty sure I have unmodified .htaccess.
The problem exists when I remove from .htaccess everything, with the exception of:
ErrorDocument 404 /index.phpand
RewriteEngine on(which is bare minimum for rewriting to work it seems).
There are absolutely no errors in logs of Drupal, Apache and MySQL.
My Virtual Host: http://pastebin.com/R5hRQMWc
My .htaccess: http://pastebin.com/xM5Kj1yd
System: Ubuntu 14.04, Apache 2.4.7, PHP 5.5.9-1ubuntu4.2 , mysql Ver 14.14 Distrib 5.5.37
Any ideas what is going on and why only Drupal is affected?