An error occurs when enabling a monitoring point

Problem

After switching a monitoring point to Enabled, it has an Error state. As a result, the node associated with this monitoring point is switched to the Operation disrupted state. The list of notifications about application operating issues also shows a message regarding disrupted operation due to detected issues at the monitoring point.

Solution

The Error state at the monitoring point may be associated with an unsupported operational state of a network interface. For successful completion of a scan when a monitoring point is enabled, the network interface must have the UP operational state. Other states of a network interface (for example, UNKNOWN) will switch the monitoring point to the Error state due to possible issues when receiving or processing network packets.

You can use the ip link command to check the current operational state of a network interface on a node computer. Information about the current operational state is displayed in the string containing the name of the interface in the following format: state <state>. The most likely operational states on a problematic network interface are as follows:

• DOWN. In this case, you can switch the interface to the UP operational state by using the following command:

  sudo ip link set <interface name> up

• UNKNOWN. This operational state may be due to an incorrectly added interface. For example, network interfaces that were added by default on a VMware virtual machine may operate in the UNKNOWN state. In this case, it is recommended to re-add (create) a network interface with the correct settings by using the corresponding resources for managing network interfaces.

After switching a network interface to the UP state, check the state of the monitoring point that was added to this network interface. If the monitoring point is still in the Error state, disable and then re-enable this monitoring point.