Socket error Windows getInputStream

Hello,

Java version is 1.5.0_09. I am trying to connect from a Windows
machine to another Windows machine using sockets . Getting a socket
error for the following line. and throws EOFException

Socket s = null;
ObjectInputStream sin = null;
ObjectOutputStream sout = null;

s = new Socket( host, port );
sout = new ObjectOutputStream( s.getOutputStream() );

//write data to socket
sout.writeObject( req );
sout.flush();

InputStream is = s.getInputStream() );
sin = new ObjectInputStream( is ); // This line gives error

If I step into ObjectInputStream, I see:

public ObjectInputStream(InputStream in) throws IOException {
    verifySubclass();
    bin = new BlockDataInputStream(in);
    handles = new HandleTable(10);
    vlist = new ValidationList();
    enableOverride = false;
    readStreamHeader(); // This line gives error
    bin.setBlockDataMode(true);
 }

However, the same code works when I try to connect from Linux(Red Hat
Enterprise Linux WS release 4 (Nahant Update 5)) to Windows. Turned
off Windows firewall but no luck.

On the Windows Server I am trying to connect to a server agent waiting
on port 2002 that helps me connect to Citrix running on that machine.
The agent runs as a Windows service.

What could be wrong here?

Stack Trace

java.io.EOFException
    at java.io.ObjectInputStream
$PeekInputStream.readFully(ObjectInputStream.java:2228)
    at java.io.ObjectInputStream
$BlockDataInputStream.readShort(ObjectInputStream.java:2694)
    at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:
761)
    at java.io.ObjectInputStream.<init>(ObjectInputStream.java:277)
....
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
202)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
173)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:
213)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:
178)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
126)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
105)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:
107)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
148)
    at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
869)
    at org.apache.coyote.http11.Http11BaseProtocol
$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:
664)
    at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:
527)
    at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:
80)
    at org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run(ThreadPool.java:684)
    at java.lang.Thread.run(Thread.java:595)