By default, the Configuration Tool listens on port 9850 on the Windows/Linux system.
To change the port number, update the EV400_CONFIG_PORT value in the configuration file:
On Windows: \Program Files\EView Technology\EView400i\conf\ev400info
On Linux: /etc/opt/OV/share/conf/vp400/vp400info
Then restart the service:
On Windows: Stop and restart the "Ironstream IBM i Configuration Tool" service
On Linux:
service vp400conf stop service vp400conf start