queryTaskWithin = new esri.tasks.QueryTask("http://rmgsc.cr.usgs.gov/ArcGIS/rest/services/nhss_haz/MapServer/0");
Error: Unable to load /proxy/proxy.ashx?http://rmgsc.cr.usgs.gov/ArcGIS/rest/services/nhss_haz/MapServer/0/query status:403
What I understand from your description, place this http://services.arcgisonline.com/clientaccesspolicy.xml xml file in root directory of your server. Also place http://services.arcgisonline.com/crossdomain.xml this xml file in your servers root directory.What I mean from server's root directory is the same directory where you placed your proxy.These XML's help in granting access to request's coming from other domains to your server.
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