For some months I've been running a wordpress instance without big problems. Recently I have changed the domain name (same machine) following these instructions. Yesterday I went to bed quite happy as everything worked correctly (images, pages, posts, comments, plugins, etc). But this morning it's not working!
I can't access wp-login.php (it's there, with rights -rw-r--r--, the same as the other files).
I can't access any page of the website (yesterday I was able).
Any ideas? Thanks in advance.