Why failed to connect to the server when adding to monitoring?

Check the Internet access to the Internet.

First of all, check that your server can be seen on the global network, and that any user can connect to your server via the Internet. So that your server is available to everyone, it must have an external IP address. This service can provide you with your Internet provider or use a VPS server.

Make our IP address - on the white list.

Your hosting can mistakenly block the IP address of our server. We need to make our IP address - on the white list. The technical support of your hosting can help you with this.

For minecraft servers, turn on Enable-Query.

So that we can monitor your server, indicate the Enable-Query = True value in the Server.properties file. Important! In order for the changes to enter into force, it is necessary to restart the server. If possible, allow requests for the UDP protocol.

Use reliable DNS.

If DNS is often unavailable, then your server in monitoring will constantly be displayed with offline status. If you are not sure of the constant availability of your DNS, indicate the IP address of the server.