How To: Transfer an ArcIMS license from an one server to another
Instructions provided describe how to transfer an ArcIMS license from one server to another.
If the new and the old server have the same ArcIMS version installed, and the old server is to be retired, then use the same registration code or .ecp file to authorize ArcIMS on the new server.
If the new server is installed with a newer version of ArcIMS, contact ESRI Customer Service to receive a new registration code.
For the steps on how to register ArcIMS, see the section in the ArcIMS Installation Guide on using the ArcIMS Postinstallation.