Not able to discover a device

Problem

Not able to discover a device

Solution

1. Check whether the device can ping from NetGain
2. Check firewall rules
        ~SNMP communication
                -Connection initiated from EM:
                       Managed Device's UDP port 161
                -Connection initiated from Managed Device:
                       EM's UDP port 162
        ~Agent communication:
                -Connection initiated from EM:
                       Managed Device's TCP port 1802 & 1850
                -Connection initiated from Managed Device:
                        EM's TCP port 81
3. Check the inputs such as Community name if SNMP based
4. Check agent log whether started successfully if agent based