XMPP : BOSH client using Blabber not getting response over proxy - xmpp

Question

I am trying establish BOSH connection to a openfire server on port 7070 with firewall unblocked and openfire actively listening. Without proxy it works well with openfire running on same network but with proxy getting the following error,
java.io.IOException: java.net.SocketTimeoutException: Read timed out
at rocks.xmpp.core.session.XmppSession.connect(XmppSession.java:737)
at com.geo.XMPPBosh.XMPPDemo.main(XMPPDemo.java:45)
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:152)
at java.net.SocketInputStream.read(SocketInputStream.java:122)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
at rocks.xmpp.extensions.httpbind.BoshConnection$2.run(BoshConnection.java:564)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Exception in thread "main" java.lang.IllegalStateException: You must be connected to the server before trying to login.
at rocks.xmpp.core.session.XmppSession.login(XmppSession.java:827)
at com.geo.XMPPBosh.XMPPDemo.main(XMPPDemo.java:52)
Below is the code,
BoshConnectionConfiguration boshConfiguration = BoshConnectionConfiguration
.builder().hostname("remote address").port(7070)
.proxy(new Proxy(Proxy.Type.HTTP,new InetSocketAddress("proxy address", 10015))).file("/http-bind/").wait(5000).build();
Pl help on what might be the cause or the solution.