Non snmp nodes

Non snmp nodes

I am running opmanager 5.6. On discovery some of my servers are being picked up as non-snmp nodes even though the snmp agent is running on them and all snmp parameters are correctly configured. This is driving me mad now as I have tried everything possible to correct it. I was wondering if there is perhaps a security setting that might be enabled on the servers. Has anyone come across this problem or have any ideas on fixing it as I could really use the input. Thanks.

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