Device or check provides no current values

First check Last check, the status and the specific message for the affected device. Then check the following in order:

  1. Is the device activated and started?

  2. Is the relevant check enabled and saved?

  3. Is a configured dependency blocking it?

  4. Is the destination address correct, and does the check use the right credentials?

  5. For a remote device, is the correct data collector assigned and online?

  6. Does the connection test with the same values show a specific error?

  7. Does the interface or server diagnostics report a problem with the background service?

Symptom

Check and remedy

Device exists but is not monitored

Enable an appropriate check in Configure and select Save all.

Test succeeds, but no values appear later

Check whether the tested values were actually saved and the check is enabled.

No ping response

Check the destination address and ICMP reachability. A target may offer other services even if it blocks ping.

Overdue

Check the last check, background service, server load and, if applicable, data collector.

Some values are missing

Check the target system, access permissions and supported readings; values not supplied are not interpreted as zero.

SSH connection refused

Check the port, user, private key and stored server key.

SSH server key changed

Verify the cause of the change on the target before retrieving and saving the current key again.

SNMP connection failed

Check the version, community or SNMPv3 user, protocols, port and allowed source address.

Windows provides no values

Check WinRM over HTTPS, credentials, certificate trust and authorization for the selected queries.

HTTPS or certificate error

Check the address, hostname, certificate chain, validity and configured trust.

No network interface rate after setup

Consecutive measurements are required to calculate counter differences.

Unintended change to check target

Check the device address and separately saved HTTP URLs. Changing the device address does not automatically update an independent web address.

Changes are rejected

Read the message, refresh the view and edit again. Multiple users may have changed the same configuration in the meantime.