"Invalid HTTP server response [401] - Unauthorized." message with Web Service on JBoss

Issue

• Web Service client throws the following exceptions :

  javax.xml.ws.WebServiceException: java.io.IOException: Could not transmit message
          at org.jboss.ws.core.jaxws.client.ClientImpl.handleRemoteException(ClientImpl.java:307)
          at org.jboss.ws.core.jaxws.client.ClientImpl.invoke(ClientImpl.java:245)
          at org.jboss.ws.core.jaxws.client.ClientProxy.invoke(ClientProxy.java:164)
          at org.jboss.ws.core.jaxws.client.ClientProxy.invoke(ClientProxy.java:150)
          at $Proxy291.findItem(Unknown Source)
          at com.aaa.bbb.obtp.exchange.MSExchange.getNewEmail(MSExchange.java:198)
          at com.aaa.bbb.obtp.exchange.ListenForExchangeResponses.run(ListenForExchangeResponses.java:97)
          at java.lang.Thread.run(Unknown Source)
  Caused by: java.io.IOException: Could not transmit message
          at org.jboss.ws.core.client.RemotingConnectionImpl.invoke(RemotingConnectionImpl.java:210)
          at org.jboss.ws.core.client.SOAPRemotingConnection.invoke(SOAPRemotingConnection.java:77)
          at org.jboss.ws.core.CommonClient.invoke(CommonClient.java:337)
          at org.jboss.ws.core.jaxws.client.ClientImpl.invoke(ClientImpl.java:233)
          ... 6 more
  Caused by: org.jboss.remoting.CannotConnectException: Can not connect http client invoker. Invalid HTTP server response [401] - Unauthorized. Response: Unauthorized/401.
          at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:368)
          at org.jboss.remoting.transport.http.HTTPClientInvoker.transport(HTTPClientInvoker.java:148)
          at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:141)
          at org.jboss.remoting.Client.invoke(Client.java:1858)
          at org.jboss.remoting.Client.invoke(Client.java:718)
          at org.jboss.ws.core.client.RemotingConnectionImpl.invoke(RemotingConnectionImpl.java:189)
          ... 9 more
  Caused by: org.jboss.ws.WSException: Invalid HTTP server response [401] - Unauthorized
          at org.jboss.ws.core.soap.SOAPMessageUnMarshaller.read(SOAPMessageUnMarshaller.java:77)
          at org.jboss.remoting.transport.http.HTTPClientInvoker.readResponse(HTTPClientInvoker.java:548)
          at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:322)
          ... 14 more