Prometheus error while trying to get metrices from wmi_exporter

I have installed WMI_exporter on windows server. For some servers I’m able to get metrices on prometheus console, But some servers are not reporting on Prometheus console.

Get “http://IP:port/metrics”: dial tcp IP:port: connectex: No connection could be made because the target machine actively refused it.

Get “http://IP:port/metrics”: context deadline exceeded

I don’t know why the machine refused to make connection with prometheus, though wmi_exporter is configured correctly on all servers.