The file ni_httpClient.dll in C:\Program Files (x86)\National Instruments\Shared\LabVIEW Run-Time\2012 will be deleted sometimes during upgrade one version to another version.
e.g. upgrade from v1.5.1 to v1.5.2. Upgrade process is
1) Uninstall v1.5.1 via National Instruments software in control panel.
2) Installed Ni adapter 1.5.2.
The dll file is deleted. Then adapter ends with http error.
Thanks for your posting and we did some investigation on this problem.
The root reason is that you have replaced ni_httpClient.dll in <C:\Program Files (x86)\National Instruments\Shared\LabVIEW Run-Time\2012> with another ni_httpClient.dll of LabVIEW 2013 version.
Anyway, it's our fault. We should give the 2012 version ni-httpClient.dll instead of 2013 version to you from 1.0 Adapter.