Specifies the alternate port to be used if the primary server specified by HOSTNAME and PORT cannot be contacted (Client Reroute.)
This parameter specifies the port number of the alternate server of the database manager instance where the alternate server for the database resides.
If the primary server returns alternate server information, it will override this AltPort setting. However, this keyword is read only. That means the db2cli.ini will not be updated with the alternate server information received from the primary server.