I tried to connect to my MM via Firefox on Port 8080. By it doesn´t works. I got the error “connection refused”.
When I tried to connect via telnet I get the error “connection error”.
But my whiteList is completely open.

My config is

var config = {
        address: "localhost",   // Address to listen on, can be:
                                                        // - "localhost", "127.0.0.1", "::1" to listen on loopback interface
                                                        // - another specific IPv4/6 to listen on a specific interface
                                                        // - "0.0.0.0", "::" to listen on any interface
                                                        // Default, when address config is left out or empty, is "localhost"
        electronOptions: {
        webPreferences: {
        webviewTag: true
                }
        },
        port: 8080,
        basePath: "/",  // The URL path where MagicMirror is hosted. If you are using a Reverse proxy
                                        // you must set the sub path here. basePath must end with a /
        ipWhitelist: [],        //**** Set [] to allow all IP addresses
                                                                                                                        // or add a specific IPv4 of 192.168.1.5 :
                                                                                                                        // ["127.0.0.1", "::ffff:127.0.0.1", "::1", "::ffff:192.168.1.5"],
                                                                                                                        // or IPv4 range of 192.168.3.0 --> 192.168.3.15 use CIDR format :
                                                                                                                        // ["127.0.0.1", "::ffff:127.0.0.1", "::1", "::ffff:192.168.3.0/28"],

        useHttps: false,                // Support HTTPS or not, default "false" will use HTTP
        httpsPrivateKey: "",    // HTTPS private key path, only require when useHttps is true
        httpsCertificate: "",   // HTTPS Certificate path, only require when useHttps is true

        language: "de",
        logLevel: ["INFO", "LOG", "WARN", "ERROR"],
        timeFormat: 24,

So I allow all IPs.

My second MM has the same whiteList. And I can connect.

It would be fine, when you have some good ideas for me to help.

Thank you in advance.
Lars