When you look up how to change the SNMP community for ESXi 5.1, VMWare has an article that displays the command to change the community of the SNMP service via the esxcli command.
But when you attempt to actually start the service in the GUI, you get this error:
This leads to an article by VMWare about this and how to solve it. Unfortunately, this does not work. There is a small piece missing.
Instead of using the xml they have listed, try this one. They key here is “<snmpSettings><enable>true” rather than false.
<?xml version=”1.0″ encoding=”ISO-8859-1″?>
Remember to swap out the xxxx with your SNMP community.
Then hop in the GUI and you will be able to start the SNMP service.