In the navigation tree, expand the Stand-Alone Instances node.
Select the node for the instance whose SNMP port number you want to change (for example, standalone-instance1).
On the page for the server instance, click the Properties tab.
Click the Instance Properties tab.
If the snmp-adapter-port property is in the Additional Properties list, specify the appropriate port number in the Value field, then go to step 7.
If the snmp-adapter-port property is not in the Additional Properties list, perform these steps:
Stop and restart the server.