## Port knocking Sometimes it can be useful to protect the **ssh port** of a server from attack, especially if the server is available on internet. [Port knocking](https://en.wikipedia.org/wiki/Port_knocking) is one of the well known method. **KiTTY** can handle with port knocking sequence. Define you sequence in **Connection** tab of the configuration box.  The sequence is a coma separated list of ***port***:***protocol***.