I am calling a geoprocessing REST service and the results are not coming back. This exact same code works on an XP/Server 2003 machine but it doesn't work on a Server 2008 R2 machine. I'm using the same version of ArcServer. The tool returns 4 parameters and all 4 of them failed with the error "Unable to get value of param" with a fault code of 500. Does anyone have any idea what is wrong? The geoprocessing tool works - the results are all there in the appropriate subfolder of the arcgisjobs directory.