Chapter 10 Install and System Administration for FortiOS 5.0 : Using the CLI : Connecting to the CLI : Connecting to the CLI using Telnet
  
Connecting to the CLI using Telnet
Once the FortiGate unit is configured to accept Telnet connections, you can use a Telnet client on your management computer to connect to the CLI.
 
Telnet is not a secure access method. SSH should be used to access the CLI from the Internet or any other untrusted network.
Before you can connect to the CLI using Telnet, you must first configure a network interface to accept SSH connections. For details, see “Enabling access to the CLI through the network (SSH or Telnet)”.
To connect to the CLI using Telnet
1. On your management computer, start a Telnet client.
2. Connect to a FortiGate network interface on which you have enabled Telnet.
3. Type a valid administrator account name (such as admin) and press Enter.
4. Type the password for this administrator account and press Enter.
The FortiGate unit displays a command prompt (its host name followed by a #). You can now enter CLI commands.
 
If three incorrect login or password attempts occur in a row, you will be disconnected. If this occurs, wait one minute, then reconnect to attempt the login again.
See Also
Connecting to the CLI using a local console
Connecting to the CLI using SSH