anonymous comment doesn't work

did anyone know this problem? i used wordpress 3.3.1 and activate multisite feature, everithing works except one. an anonymous poeple cannot comment, when it try to give comment (off course fill name, email and website) and klik the post comment button, my website redirect to error 404-not found. but when registered user give a comment, everithing work fine.
i try to change setting in general, writing, reading and discussion but it doesn’t fix it.
i try to disabled all plugin, use default setting and change the .htaccess but it’s didn’t fix it.

here my website https://www.goblooge.com/

thank for your help and sorry about my bad english