Changing host names in distributed environment

Version 1

    We have a 3 node distributed environment and only the host names are changing, NOT the URL the users connect to or the IP addresses. I thought a tabadmin config then tabadmin reset would work but received this message: image001.png

     

    I've gone through the admin guide and found some info on what to do when the IP address changes but not the host name. Anyone have any ideas?