Nodejs OPC-UA server certificat error without using any tls or certificates

Question

I do create an opc-ua server like this:

var opcOptions = {
        hostname: options.opcHost || "127.0.0.1",
        port: options.opcPort || 4334,
        resourcePath: options.opcName || "opcua",
        buildInfo: {
            productName: "OPCUA",
            buildNumber: "0.1",
            buildDate: new Date()
        }
    }

    var server = new opcua.OPCUAServer(opcOptions);

But this will somehow spawn this error message in the console:

10:45:20.058Z :verify                        :48    [NODE-OPCUA-W06] The certificate subjectAltName does not match the server applicationUri
 ...                                                Please regenerate a specific certificate that matches your server applicationUri
 ...                                                certificate subjectAltName  = urn:DESKTOP-6B2NRGG:NodeOPCUA-Server
 ...                                                server applicationUri  = urn:WIN01:NodeOPCUA-Server
 ...                                                certificateFile         = C:\Users\xxx\AppData\Roaming\node-opcua-default-nodejs\Config\PKI\own\certs\certificate.pem

Any idea on how to ignore/disable this message?

Answer 1

Turns out that node-opcua does create some kind of certificate that is used for the server even if the server does not use tls. And after I run my software for the first time that certificate was created with the current hostname of my computer. Not long ago I did change my hostname so this certificate was not valid anymore.

The location of those files is C:\Users\user\AppData\Roaming\node-opcua-default-nodejs.

Deleting the whole folder will prompt node-opcua to recreate them with all certificates at software start and after that the error message was gone.