httpclient 4.1.2: ssl connection can not be setup using sun jvm 64-Bit Server VM (build 1.5.0_10-b03, mixed mode) on linux

Hi,
We are trying to replace httpclient 3.x with 4.1.2 and want to use some new features in 4.1.2.
Our test program tries to use HTTPS to make a web call on a remote server.
Our test program runs fine under jdk 1.6. and it gets the following under JDK 1.5 which it is our production environment.

java.net.SocketException: Socket Closed
at java.net.PlainSocketImpl.setOption(PlainSocketImpl.java:201)
at java.net.Socket.setTcpNoDelay(Socket.java:838)
at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.setTcpNoDelay(BaseSSLSocketImpl.java:309)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.prepareSocket(DefaultClientConnectionOperator.java:222)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:153)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:573)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:425)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:776)
at net.amadeus.sip.httplink.client.TestDriver2.sendMessage(TestDriver2.java:175)
at net.amadeus.sip.httplink.client.TestDriver2.main(TestDriver2.java:242)

If needed, i can upload my test program.

Can you please investigate why the httpclient 4.1.2 does not work under JDK 1.5.x?

Thanks for any idea and help.

Fenghui