For security it is better to change the port in webmin from 10000 to another number to do this change that in webmin.

Login to webmin

Under Webmin>Webmin Configuration>Ports and Addresses

Under Listen on port: choose a 5 digit number.

 

Then in ssh root

you need to allow the new port

 

with the command:

system-config-securitylevel-tui

 

Use tab to get to Customize then add your port.