UnhandledPromiseRejectionWarning: Error: connect ETIMEDOUT 45.43.63.117:20334

[vigorousdeveloper]

Hello
I would like to get balance in testnet.
const newaddress = new Address("AXpNeebiUZZQxLff6czjpHZ3Tftj8go2TF");
console.log("newAddress: ", newaddress);
const nodeUrl = "http://polaris1.ont.io:20334"; // Testnet
const rest = new RestClient(nodeUrl);
console.log("rest: ", rest);
let balance = await rest.getBalance(newaddress);
console.log("balance: ", balance);
But the above error is occured.
How can I fix it?