Hi,
If your configuration works on one one machine and not on other one it could be problem with JCE Policy. You can check it in 'Ecosystem Configuration'.
Also it could be related to network settings, do you have both computers in same network? Sometimes VPN connection or connection from different network may cause troubles. Cross-realm configuration is not currently supported by Toad for Hadoop so I'd advice to stick with realm configuration used by Hadoop components.
BR,
JK