why does not Grinder consider JVM httpp-proxy setting?

I am using Grinder 3.11. I have tried with following Grinder option  to 
access Internet based application through an HTTP Proxy server. But it 
gives HTTP 407 (Authorization Required) error.

connectionDefaults.setProxyServer("proxy.mydomain.com", 8080)



Can any one help me understand why Grinder does not consider any of the 
following settings to access Internet based application through an HTTP 
Proxy server. 

grinder.jvm.arguments = -Dhttp.proxyHost=172.18.18.12 
-Dhttp.proxyPort=8080

or

System.getProperties().put("http.proxyHost", "proxy.mydomain.com")
System.getProperties().put("http.proxyPort", "8080")


Whereas the following Java code works fine with no error and I am able to 
get status code as 200.

URL url = new URL("http://www.apache.org/"); 
System.setProperty("http.proxyHost", "proxy.mydomain.com");
System.setProperty("http.proxyPort", "8080"); 
HttpURLConnection urlConnection = (HttpURLConnection) 
url.openConnection();



Best Regards
Lutfur Rahaman
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