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Telnet Client authentication

Updated: January 21, 2005

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Telnet Client authentication

You can use your local Windows user name and password or domain account information to access a computer running Telnet Server.

If you do not use the NTLM option for authentication, the user name and password are sent to the Telnet server as plaintext.

If you use NTLM authentication, Telnet Client uses the Windows security context for authentication, and the user is not prompted for a user name and password. The user name and password are encrypted.

Attempts to log on to the Telnet server using NTLM authentication will fail if the password option is set at User Must Change Password at Next Log on. To log on successfully, you must log on to the server directly, change your password, and then log on through Telnet Client.

If you connect to a Telnet server using NTLM authentication, you will not be able to access additional network resources because of a limitation of the NTLM authentication. In order to access network resources from a Telnet session, you need to access network drives by providing your user name and password again.


  • Although authentication might be encrypted, the actual data being transferred can be read by anyone on the network. Because Telnet session traffic is not secure, ensure that no sensitive data is sent or received during a Telnet session.

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