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Error Message: “Connection refused by host”

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This document aims to solve the error shown when making a query from the OpMon on your Windows Server.


When making the query from the OpMon in the Windows Server, accurs the error “Connection refused by host“.

[root@opmon]# /usr/local/opmon/libexec/check_nrpe -H IP_DO_SERVIDOR
Connection refused by host


To verify if the installation was successfully concluded, and the service is running, just run the command below on the “Command Prompt”.


In the window “Service Management” check wheter the agent is “Started”. You also can “Start”, “Stop” or “Restart” with the commands beside, as shown the imagem below:


Check whether you can access the destination IP, maybe the problem is routing.

PING ( 56(84)bytes of data.
64 bytes from ttl=64 time=2.10ms
--- ping statistics ---1 packets transmitted,
1 received, 0% packet loss, time 0ms
rrt min/avg/max/mdev=2.104/2.104/2.104/0.000ms

[root@opmon~]# traceroute
traceroute to, 30 hops max, 40 byte packets 1.058ms 0.984ms 0.926ms
Updated on 01/09/2021

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