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Telnet
The Telnet is
another popular remote control tool that
allows a Telnet client to connect across a
network and access a command session. You can us it for logging on to remote
computers over a LAN or the Internet. Using Telnet protocol, you can contact
the remote host by using either the name or IP like 192.168.1.1.
If you are
attempting to use Telnet to connect to a member server that is using basic
security, you must have permissions to log on to the local computer. If the
server is using challenge/response (NTLM) security, then you simply logon to
the server from the network (as you do in a file share). The basic Telnet
client for Windows NT does not support the NTLM feature.
NOTE: To use a GUI-based Telnet client on a
Windows 2000-based computer, obtain a copy of the Telnet.exe file from a
Windows NT 4.0-based computer, rename it to Telnet32.exe, and then copy it to
the Windows 2000-based computer. Telnet.exe is located in the C:\Winnt\System32
folder. Telnet for Windows 2000 does not have a Graphical User Interface
(GUI).
By default,
the Win 2000 Telnet service requires NTLM authentication. However, if Win 2000
is configured to use Kerberos as its default authentication method, then
Telnet users are not able to obtain access to domain/AD resources including
network validation. To configure the Win 2000 Telnet Service to not require
NTLM, run
Telnet Server Administration, select
option 3,
Display / change registry settings and then select option 7,
NTLM. Change the default setting from 2 to 0 to disable the NTLM
requirement.
Connection to host lost
Symptoms: when attempting to
telnet a remote computer, you may receive "Connection to host lost" message.
Resolutions: 1. make sure the
telnet service is running.
2. check the security such as belonging to telnetclients group, NTLM
authentication and logon locally.
3. No firewall and Proxy running on client.
To use telnet, you must start the telnet service on the remote host. By
default, the Telnet service startup type is set to
Manual when you install Wi2K/XP.
To tart the Telnet Service manually, 1) use net start telnet
command; 2) go to Start>Programs>Administrative
Tools>Telnet Server Administration, at the command
prompt, type 4 to start the Telnet service; 3) go to Start>Programs>Administrative
Tools>Services>Telnet service, and
then click Start.
To start the Telnet Service automatically,
go to Start>Programs>Administrative
Tools>Services>Telnet service,
right-click Properties and select Automatic on
Startup type box.
To connect a host by using the Telnet service, type the following command
telnet ip_address/server_name (where
ip_address is the host's IP address and server_name is the
host's name). NOTE: By default, the server uses NTLM
authentication and will prompt for a user name and password.
The Telnet Server Service Administration
tool includes options that you can use to start, stop, or get information
about the Windows 2000 Telnet Server service. You can get a list of current
users, terminate a user's session, and change Telnet registry settings. To run
the tool, type
tlntadmn.exe in
command prompt, and then click OK, or
go to Start>Programs>Administrative
Tools>Telnet Server Administration.
Use Telnet to Test an
Internet Mail Connection
Use telnet mail server name or IP 110 to test POP. You should
get +OK Microsoft Exchange 2000 POP3 server...ready. Otherwise, you get
Connection failed. Use telnet mail server name or IP 25 to test SMTP. You
should get 220 mail.domain.com... ready response. Otherwise, you get
Connection failed.
Use Telnet to test Terminal
Server
If a TS client connect to TS through a firewall or router,
you must open TCP port 3389. To test the port is opened or not, you can use
telnet host name or ip 3389. If the test is successful, you will receive
the telnet screen and a cursor. If not, you will get Connection failed
message.
Use telnet to test XP Firewall
If you enable ICS feature in Windows XP, you should be able
to test it by using telnet host name or ip 389. If the test is
successful, you will receive the telnet screen and a cursor. If not, you will
get Connection failed message.
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