server url

Hi everyone

When I have set up the server, I will change the server URL. 

At the first time, I use "http://tm_server_test" as server URL. And the browser can't visit the URL address.

So I change it as "http://tm-server-test". It works.

Now I know that we can't use underline in DNS, so I suggest that it had better to add recommend when we change the server URL. 

I think it will be convenient for users.

Thanks.