Server health monitoring not working opmanager

Server health monitoring not working opmanager

Hi, I'm new user op manager.I installed op manager centos 6.4 64 bit.I want to monitor all of my server,such as vm ware esxi,centos and windows server.At first i discovered all linux server.I see service monitor working but performance monitor not working.I see my all linux server snmp running and i add Credential Details, but when i want to test Credential than it show SNMP Passed CLI Failed Failure Reasons CLI Incorrect Login Parameters I cant understand how to resolve this issue or i think missing some thing for monitoring performance.

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