Handle connection request failures for TCP/IP

The main causes for failed connection requests at a server configured for TCP/IP use is that the DDM TCP/IP server is not started, an authorization error occurred, or the machine is not running.

• DDM server is not started or the port ID is not valid
  The error message given if the DDM TCP/IP server is not started is CPE3425.
• DDM connection authorization failure
  The error messages given for an authorization failure is CPF9190.
• DDM server not available
  If a remote server is not up and running, or if you specify an incorrect IP address or remote location name in the DDM file, you will get message CPE3447.
• Not enough prestart jobs at server
  If the number of prestart jobs associated with the TCP/IP server is limited by the QRWTSRVR prestart job entry of the QUSRWRK or user-defined subsystem, and all prestart jobs are being used for a connection, an attempt at a new connection will fail with these messages.