iluminada

Found the cause: wp-comments-post.php had the wrong permissions set. Not sure how it got that way (I didn’t manually change it), but it needs to be set to 644.

OK, I had this problem and was completely stumped for a long time. Found the cause: wp-comments-post.php had the wrong permissions set. Not sure how it got that way (I didn’t manually change it), but it needs to be set to 644.

I’m having this issue as well, and have performed all of the above troubleshooting suggestions, without a resolution. I have also tried activating new themes. The really strange thing is that spammers are still injecting comment spam from time-to-time, but legit registered users get a 404 when posting a comment. I’m totally stumped.

I’ve also tried replacing my theme’s comments.php file and my root wp-comments-post.php file. I am running 2.8.5, but the problem began with 2.8.1.

Any further suggestions will be greatly appreciated.

I was having this same issue, getting an http error on image upload when using the media manager. I had my whole blog password protected via a .htaccess pwd instead of using WordPress’ “password protect blog” setting. Disabled the .htpassword for my blog and all is well.