Make sure the permissions on that file are set correctly. It needs to be at least readable and maybe executable, depending on your host's set-up. Set the permissions to 755 and see if that fixes it.

hi,

I've changed the file permission to 755, but still got the same error message. Anyway, the others .php files only have permission 644, but still accessible.

btw, I've just tried to click the preview button instead of save button, and the strange thing is, this error message occurs:

Forbidden
You don't have permission to access /index.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

But I actually can access index.php directly from my browser to view the blog. I also can add comments on the already published blog.

any other idea?

thanks.

Sounds to me like a server problem. Have you talked with your host about it?

Not yet. I'll ask the host :)

thanks.

I have been having this exact problem since thursday.