Sorry to report this, and maybe it's just me, but in the beta version of 1.3.5.1 and now 1.4.0.0 push downloads seem completely broken.

In these versions I've yet to see a push reply of any kind from any server in the extended info (even a busy reply), and no firewalled host has ever worked. Yet if I load up the older version I see the very same servers respond to the push (at least until the push route dies).

There was a bug with re-searching Swabby fixed in 1.3.5.0, but sadly, perhaps the fix is worse than the disease.