Bandit 14 → 15
OverTheWire 
Linux Progressive Goal: send the current level’s password to the service on localhost port 30000 to receive the next password.
Approach
Section titled “Approach”Connect to the port and send the current password. The service replies with the next one.
bandit14@bandit:~$ nc localhost 30000<password>Correct!The password you are looking for is: <password>Password
8xCjnmgoKbGLhHFAZlGE5Tmu4M2tKJQoWhy it works
Section titled “Why it works”The level gates the next secret behind proof you already hold the current one. The service speaks a plain line protocol over a raw TCP socket, so a bare nc (or telnet) is enough to talk to it. No encoding, no TLS.