This morning I tried to read an article of the blog, and I got an “Error 500″ message. First of all, I checked that my Wordpress was working, because I could access to my dashboard. Next step: deactivate all the plugins. But it didnt work. So lets take a look into the Apache log. What I found was:

SoftException in Application.cpp:252: File “/home/xxxxx/public_html/blog/index.php” is writeable by group

Thats it: a permissions problem. So I used Cyberduck (but you can use any other FTP application) to fix it. Delete the “write” permissions of Group and Others:

Note: be sure to apply this to all your files and directories. In my case, as you can see in the image, I used the option “Apply changes recursively”. Your FTP application should have the option to do something like this.

In the root directory of your Wordpress installation, you should have a file called “.htaccess”. You have to edit this file, adding the following line:

SecFilterEngine off

With this single line, your blog will work perfectly.