By default Autosys uses 162 port number to send SNMP traps. However when you want to change the port number. You may have to change snmp-trap and snmptrap port number in services file.
For example in Linux
services in /etc/services
]$ cat services|grep snmp-trap
snmptrap 162/udp snmp-trap # Traps for SNMP
You have to replace 162 port with the respective port and bounce Scheduler services.