Was going to write this as a comment, but I thought I'd make it a full-blown answer instead...
The issue still exists, but however it just seems to be a matter of the server certificate rather than the actual server availability itself:
when loading the Snippet as a full-page frame:
After clicking 'Advanced' and clicking 'Proceed', I can go back to the Snippet and see it perfectly.
On Chrome 44.0.2403.130 (Official Build) m (32-bit), Windows 10 Pro x64. System clock is synced, so it's almost certainly server-side.
As discussed in the Tavern, it turns out that quite simply, the incorrect SSL certificate is installed on
stacksnippets.net. An issue which is easily fixed.