java - HTTPURLConnection with SOCKS proxy -

i have launched machine on amazon ec2 , have port 22 open world (so ssh machine allowed). created tunnel machine using:

/usr/bin/ssh -c -n -d '*:20022' -i <ssh_key_file> -o serveraliveinterval=20 -o serveralivecountmax=3 -o stricthostkeychecking=no -o userknownhostsfile=/dev/null ec2-user@ec2-a-b-c-d.compute-1.amazonaws.com 

note above public dns.

the tunnel works fine, because i'm getting correct output when run curl command:

curl --proxy socks5h://127.0.0.1:20022 https://ec2-a-b-c-d.compute-1.amazonaws.com:<my_port> 

however, i'm not able establish connection using java , httpurlconnection using same socks proxy. here's piece of code:

import sun.net.www.protocol.http.httpurlconnection;  import java.net.inetsocketaddress; import java.net.proxy; import java.net.url;  public static void main(string[] args) throws exception {   string urlstring = "http://ec2-a-b-c-d.compute-1.amazonaws.com:<my_port>";    url url = new url(urlstring);   proxy proxy = new proxy(proxy.type.socks, inetsocketaddress.createunresolved("127.0.0.1", 20022));   system.out.println("opening connection: " + url.tostring() + " proxy: " + proxy);   httpurlconnection conn = (httpurlconnection) url.openconnection(proxy);    conn.connect();   return 0; } 

it times out following stack trace @ "conn.connect()" (line numbers not accurate)

exception in thread "main" java.net.socketexception: malformed reply socks server     @ java.net.sockssocketimpl.readsocksreply(sockssocketimpl.java:129)     @ java.net.sockssocketimpl.connect(sockssocketimpl.java:502)     @ java.net.socket.connect(socket.java:579)     @ java.net.socket.connect(socket.java:528)     @ sun.net.networkclient.doconnect(networkclient.java:180)     @ sun.net.www.http.httpclient.openserver(httpclient.java:432)     @ sun.net.www.http.httpclient.openserver(httpclient.java:527)     @ sun.net.www.http.httpclient.<init>(httpclient.java:211)     @ sun.net.www.http.httpclient.new(httpclient.java:308)     @ sun.net.www.http.httpclient.new(httpclient.java:326)     @ sun.net.www.protocol.http.httpurlconnection.getnewhttpclient(httpurlconnection.java:997)     @ sun.net.www.protocol.http.httpurlconnection.plainconnect(httpurlconnection.java:976)     @ sun.net.www.protocol.http.httpurlconnection.connect(httpurlconnection.java:851)     @ com.rajat.http_connection.httpconnection.run(httpconnection.java:53) 

any idea why case?