Attempting to add NetScaler device to Citrix Command Center fails with: “Discovery failed for | Error: Unable to Ping using SNMP after enabling SNMP”

Problem

You’ve just completed deploying Citrix Command Center 5.2 45.4 and attempt to add your NetScaler pair to the device list but the process fails with the following error:

Discovery failed for <NSIP>

Error: Unable to Ping using SNMP after enabling SNMP

Solution

One of the reasons why this error would be thrown is if the Citrix Command Center server is unable to access the NetScaler via UDP Port 161 as shown in the following firewall log capture:

To correct the issue, simply allow UDP port 161 from the Citrix Command Center to the NetScaler and initiate the add device process again: