Step-by-step tutorial on how to make a cracked server:
(Cracked and legit clients can join) + (No hamachi needed)

1. First you need to forward a port. Visit portforward.com for a full tutorial. (Port: 7777)
2. Once you've forwarded your port open 'TerrariaServer' and a cmd window should open.
3. If you already have a map go ahead and choose it (1 - 100) if not press 'n' and go through the options.
4. Set max players (1 - 100).
5. Next use port 7777 (Default).
6. Add a server password for if you want a private match or not.
7. Then wait for the server to start (Needs internet access).
8. After the waiting is over your server is finally up.
9. To get the IP of your server go here whatismyip.com and add the port to the end (EG 123.45.67.890:7777).
10. Finally give the IP and port to people and tell them to join (Must be same version (v1.1)).

Have fun