Bad Request—Please Help

Can anyone tell me why it is that this message comes up when a post is published.

Your browser sent a request that this server could not understand.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

this is one of the link
http://www.tabufiao.com/cds/maicol-super-star%E2%80%93el-villano-2011-2/

already check permission with the site and is okay…. please some-one help