Handshaking not happening between master and slave in jenkins

Question

How to solve this error? Error occurred since I make master ip to public and assign DNS.

Jul 27, 2012 12:44:17 PM hudson.remoting.jnlp.Main$CuiListener <init>
INFO: Hudson agent is running in headless mode.
Jul 27, 2012 12:44:17 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Locating server among [http://10.10.1.162:8080/jenkins/, http://dem
Jul 27, 2012 12:44:38 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Connecting to demo.sigmainfo.in:8050
Jul 27, 2012 12:44:38 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Handshaking
Jul 27, 2012 12:44:58 PM hudson.remoting.jnlp.Main$CuiListener error
SEVERE: The server rejected the connection:
java.lang.Exception: The server rejected the connection:
  at hudson.remoting.Engine.onConnectionRejected(Engine.java:258)
  at hudson.remoting.Engine.run(Engine.java:233)

I have seen so many thread regarding this, but didn't get any answer properly.

I connected using headless slave agent and put HOST:PORT in advanced setting of configuration of slave. Master is linux and slave is windows 7.

Answer 1

From Comments:

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Since you are having problems with the public IP & DNS, can you make sure that routing for the public IP and DNS is allowed on your network. Just to be sure this is not a firewall issue. Are you on a corporate network? In that case, your corporate firewall may be blocking certain ports on all IP addresses.