Unable to tunnel through proxy. Proxy returns HTTP/1.1 503 Service Unavailable

问题:

I want to connect to an intranet server, the url that I need to connect is:

URLConnection conn = new URL("https://mywebsite").openConnection(); 

When I reach to the connect method call through:`

conn.connect(); 

I'm getting the following exception:

java.io.IOException: Unable to tunnel through proxy. Proxy rerurns HTTP/1.1 503 Service Unavailable" at sun.net.www.protocol.httpHttpURLConnection.doTunneling 

How can I solve this exception, I have tried many solutions published on the net, but without any luck.

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