Hi,
I am getting the same error, although, I haven't secured any services, apart from the default AD security restrictions.
I get this variation of the message;
Error while using HTTPS security, URL = our-url/MapServer?f=json, HTTP Status code = 0 and Status Text =
We have SSL security in place, and everything else works well. However, in my case, the print service is implemented in the ArcGIS Viewer for Silverlight.
Thanks,
Nick