REXEC or SSH setup

REXEC and SSH rely on services provided by INETD (Internet Daemon), which is another TCP/IP service. Communications Server IP Configuration Guide (SC31-8775) describes the steps required to set up INETD, REXEC, and SSH.

A common port used by REXEC is 512. To verify the port being used, check /etc/inetd.conf and /etc/services.
  • Find the service name (1st word, exec in this example) of the rexecd server (7th word) in /etc/inetd.conf.
    exec  stream tcp nowait OMVSKERN /usr/sbin/orexecd rexecd –LV
  • Find the port (2nd word, 512 in this example) attached to this service name (1st word) in /etc/services.
    exec      512/tcp      #REXEC   Command Server

The same principle applies to SSH. Its common port is 22, and the server name is sshd.