An Interesting Bug
Try this on your wordpress blog.
Make a new post.
Type anything in the title field.
Type the words
“ftp” and “server” in the main text field you can type any other content too, but put those two words together and you will not be able to save your post.
Try to publish your test post.
Do you get the “Precondition Failed” error?
Update - I think it’s mod_security that causes that message. See
here
UPDATE:
See my newest post on this problem.