Which ASP.NET version do you currently support? In the Control Panel, under ASP.NET Version, it only says "4.x", is it 4.0, 4.5, or 4.5.1? Or all of those? Thanks
If you are on Windows 2008 then it's asp.net 4.0 If you are on Windows 2012 then it's asp.net 4.5 We don't offer asp.net 4.5.1 since its in preview and not released yet.
Is there a way to upgrade site from 2008 to 2012 server or one would have to close old and request new?
Submit a ticket with the support department and ask them to migrate your site account to a Windows 2012 server.