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
There are no specific requirements for this document.
This document is not restricted to specific software and hardware
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.
Technical Tips Conventions for more information on document
If you try to telnet to a router that does not have a Telnet password
configured, you receive this error message:
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
Note: Use the
(registered customers only)
to obtain more information on the commands used in this
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
% 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
In order to verify that the router is correctly configured for Telnet,
issue the show running-config command.
line vty 0 4
You should now be able to telnet to the router.
10.3.3.1 ... Open
This section provides information you can use to troubleshoot your
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.