Summary

Using a semicolon ( ; ) in the server-name field causes clients to be unable to join the server. No feedback is provided in the console to indicate a problem.

Steps to reproduce...

1. Open server.properties and change server-name to "Test;" without quotes
2. Start the server
3. Note no indication the server isn't or wont function
4. Open Minecraft - note the server details is stuck on locating server
5. Attempt to connect, note the immediate "Unable to Connect" screen

What I expected to happen...

Some form of feedback to advise invalid characters in name.

What actually happened...

Server starts without issue and appears to be working but no one can connect.