Shared hosting account connection reset

The server will serve up static files fine, but anything with aspx will return the below message in Firefox:

The connection to the server was reset while the page was loading

Firebug NET tab shows aborted

IE10 shows

This page can't be displayed

Chrome shows

This webpage is not available

ASP.NET Webforms 4.5, uploaded through Visual Studio 2012, using ftp publish in release