Running multiple CloverETL Server instances on the same host is not recommended. If you do so, you should ensure that the instances do not interfere with each other.
Each instance must run in a separate application server.
Each instance must have its own port to listen. Application server can have some additional opened ports, therefore you might change the configuration of the application server as well.
The instances must have different ${java.io.tmpdir} directory.
Each instance needs separate ${sanboxes.home} directory.
See the documentation of particular application server for further information on running multiple instances of the application server on the same computer.