Hi i just got around to getting my blog on a self-hosted solution, as i intend to run a wordpress multisite install on a secure install with a self signed certificate.
Long story short i get a "Can’t get recent posts for solidarp because the server reported an error: the server did not respond." error as i try to get the consiguration set.
The solution is to go, using safari, to your blog url and set to always trust the certificate, then MarsEdit will trust your site.
I recommed that the error message be changed on such situations to something like: "Can’t get recent posts for solidarp because the server reported an error: ssl certificate untrusted."