General information about REXECD
The remote execution server allows execution of a TSO
batch command that is received from a remote host. REXECD supports
both the remote execution command (REXEC) and remote shell (RSH) client
protocols.
Note: When the REXECD server is active, it has outstanding
listens on Ports 512 and 514. If you want to have a concurrent server
for the z/OS® UNIX REXECD or RSHD daemons, then configure
them to use different ports.