How to make Derby DB listen to client requests that originate from both localhost and from other machines on the network?

While start a server, you have to pass additional param -h with IP address to access the db other than localhost.

java org.apache.derby.drda.NetworkServerControl start -h 0.0.0.0

A server that is started with the -h 0.0.0.0 option will listen to client requests that originate from both localhost and from other machines on the network.

However, administrative commands (for example, org.apache.derby.drda.NetworkServerControl shutdown) can run only on the host where the server was started, even if the server was started with the -h option.