Update:
My hosting provider said that the requests were identified by the system as "false positives" - they have now added an exception to their rules,.
However, I'm getting a new error :)
http://www.muiiio.com/wp-content/uploads/2012/10/Blog_Jetpackerror.png
The screenshot includes the URL, since this time it's not WordPress.com, but rather my blog's URL.
What would you advise I do?