Warning: the idkfa server hosts have implemented an incredibly annoying security feature.
Essentially: any content being sent to the server (posts, etc.) are scanned in a similar way that one scans email for spam. Depending on the content of your message, certain words or combinations of words may put you over the threshold of what my hosts consider suspicious content. If so, you will recieve a "403 Forbidden" message, with no indication as to why.
Unfortunately, there isn't much I can do about this at the moment. I will try to research and see if there's a way I can be exempt from this. For the time being: try to sound less like spam. Thanks.