This document provides a sample configuration for how to configure a Telnet password on a Cisco router, which allows IP devices access to the router. Without a Telnet password configured, you receive the Password required, but none set error message.
There are no specific requirements for this document.
This document is not restricted to specific software and hardware versions.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Refer to Cisco Technical Tips Conventions for more information on document conventions.
If you try to telnet to a router that does not have a Telnet password configured, you receive this error message:
Router-1#telnet 10.3.3.1 Trying 10.3.3.1 ... Open Password required, but none set [Connection to 10.3.3.1 closed by foreign host]
In this section, you are presented with the information to configure a Telnet password.
This document uses the Router-2 configuration.
In order to set up the router to allow Telnet access, issue the line vty command. This command allows for the configuration of Virtual Terminal (VTY) lines for remote console access. You can configure the router to accept one or more Telnet sessions. It is strongly suggested that you configure password checking with the login and password line configuration commands. This example configures the router to accept five sessions, with the password "letmein":
Router-2(config)#line vty 0 4 Router-2(config-line)#login % Login disabled on line 66, until 'password' is set % Login disabled on line 67, until 'password' is set % Login disabled on line 68, until 'password' is set % Login disabled on line 69, until 'password' is set % Login disabled on line 70, until 'password' is set Router-2(config-line)#password letmein
In order to verify that the router is correctly configured for Telnet, issue the show running-config command.
Router-2#show running-config Building configuration... hostname Router-2 . . line vty 0 4 password letmein login . . ! end
You should now be able to telnet to the router.
Router-1#telnet 10.3.3.1 Trying 10.3.3.1 ... Open User Access Verification Password: letmein Router-2#
This section provides information you can use to troubleshoot your configuration.
When trying to configure a encrypted password in the VTY line, this error message is received:
Invalid encrypted password
The workaround is to check if the encryption service is disabled in your router. If it is disabled, then enable the encryption service. Also, in order to configure a password in the VTY line interface, it is not needed to specify any encryption method.
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Refer to Cisco Technical Tips Conventions for information on conventions used in this document.