Error when buffering

Discussion created by serena26 on Feb 20, 2012
Latest reply on Apr 13, 2012 by TOVernon
Trying to install the sample(  ) on ArcGIS Sever 10.1 prerelease. When buffering, the following information pop up:
Query Error: Unable to load proxy.ashx?http://testserver:6080/arcgis/rest/services/Geometry/GeometryServer/buffer  Status:500

OS: Window Server 2008 R2 Standard
Is there any change for the Javascript API on buffer?  Thank you very much.