system configuration
====================
JRE 7u51 and above, windows 7, IE
Submitter states that this is seen as a regression since 7u51. I haven't reproduced internally yet.
Simple javaws testcase in their environement which calls :
System.out.println("Trying to connect to: " + lServer + ":" + lPort);
InetSocketAddress lAddress = new InetSocketAddress(lServer, lPort);
lSocket = new Socket();
lSocket.connect(lAddress, 500);
and throws java.net.SocketException: Unknown proxy type : HTTP
Possible that this is related to JDK-7178362