HTTP error 403 when use proxy

Hi!

I had no problem using HttpUnit to open a web page. However, once I
set the proxy server it then give HTTP error 403:

com.meterware.httpunit.HttpException: Error on HTTP request: 403
Forbidden [http://www.anydomain.com/default.asp]
        at com.meterware.httpunit.WebClient.validateHeaders(WebClient.java:577)
        at com.meterware.httpunit.WebClient.updateClient(WebClient.java:464)
        at com.meterware.httpunit.WebWindow.updateWindow(WebWindow.java:139)
        at com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:130)
        at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:121)
        at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:102)
        at com.meterware.httpunit.WebClient.getResponse(WebClient.java:87)
        at ......


Do you have any idea what could be the problem?

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