Naming Server

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Port already in use

When you start rmiregistry the following error can occur:

java.rmi.server.ExportException: Port already in use: 1099; nested exception is: Address already in use: JVM_Bind

You can check the usage of the ports on your machine:

netstat -a

  Proto  Local Address          Foreign Address        State
  TCP    L3AFY65:epmap          L3AFY65:0              LISTENING
  TCP    L3AFY65:microsoft-ds   L3AFY65:0              LISTENING
  TCP    L3AFY65:1099           L3AFY65:0              LISTENING
  ...    ...                    ...                    ...

This can happen if RMI had accepted any clients in the last two minutes. Don't restart your PC, just wait two minutes for all the TIME_WAIT states displayed by netstat -a to disappear.
On Windows most common you have started once a registry, use Task Manager to check for an entry containing rmiregistry and kill that process.