Example grpc failure with node

example.js

var fs = require('fs');
var protoLoader = require('@grpc/proto-loader');
var grpc = require('grpc');

var protoFile = 'account.proto';
var options = { keepCase: true, longs: String, enums: String, defaults: true, oneofs: true };
var pkgDef = protoLoader.loadSync(protoFile, options);
var account = grpc.loadPackageDefinition(pkgDef).account;
var cert = fs.readFileSync('cert.pem');
var key = fs.readFileSync('key.pem');
var keyCertPair = [{private_key:key, cert_chain:cert}];
var client = new account.Accounts('dev01:5001', grpc.credentials.createSsl(null, key, cert, function () {}));
//var client = new account.Accounts('dev01:5001', grpc.credentials.createSsl());
client.Authenticate({email: 'test@example.com', password: 'password', ipAddress: "127.0.0.1", userAgent:'grpctesting'}, function(err, response) {
	console.log('Error: ', err);
	console.log('Response: ', response);
});

gistfile1.txt

E0409 18:47:45.398419000 4577918400 ssl_transport_security.cc:1245]    Handshake failed with fatal error SSL_ERROR_SSL: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed.
Error:  Error: 14 UNAVAILABLE: failed to connect to all addresses
    at Object.exports.createStatusError (.../node_modules/grpc/src/common.js:91:15)
    at Object.onReceiveStatus (.../node_modules/grpc/src/client_interceptors.js:1209:28)
    at InterceptingListener._callNext (.../node_modules/grpc/src/client_interceptors.js:568:42)
    at InterceptingListener.onReceiveStatus (.../node_modules/grpc/src/client_interceptors.js:618:8)
    at callback (.../node_modules/grpc/src/client_interceptors.js:847:24) {
  code: 14,
  metadata: Metadata { _internal_repr: {}, flags: 0 },
  details: 'failed to connect to all addresses'
}
Response:  undefined