I am getting error at Stream outputStream = req.GetRequestStream()) saying "The remote name could not be resolved: 'sampleserver3.arcgisonline.com". I have add this URL in my proxy.config http://sampleserver3.arcgisonline.com/ArcGIS/rest/services which is working fine. Also when i try to check with http://[yourmachine]/DotNet/proxy.ashx?http://services.arcgisonline.com/ArcGIS/rest/services/?f=pjson this URL, it gives the same error.
After setting mustMatch="false" in proxy.config and tried http://[yourmachine]/DotNet/proxy.ashx?http://www.google.com/ this URL, leads to same error.
Working on ArcGIS Javavascript API 3.10.
OS windows 7 Enterpriise edition SP1
Anyone know how to fix this issue???
(NOTE :PFA image for the error)