Rocket.Chat default port for a bot?

[mikebdp2]

I'm setting up a bot to connect to a server which doesn't belong to me
and this server is using the default settings for almost everything including ports.
Here's my current config:

...
func main() {
        config := &rocket.Config{
                Server:   "chat.server.com",
                Port:     "?????",
                User:     "test-1-bot",
                Email:    "test-1-bot@server.com",
                Password: "********",
                UseTLS:   false,
                Debug:    os.Getenv("DEBUG") != "",
        }
        rocket.Run(config)
}

What is a default ROCKET_PORT value: 3000, 80 or 443 ?
I tried using them all, but am getting the following results:

3000: login err: Post http://chat.server.com:3000/api/v1/login: dial tcp ...*:3000: connect: connection refused
80: login err: Request error: 405 Method Not Allowed
443: login err: Request error: 400 Bad Request