How to disconnect a telnet session ?

Router#show use
Line User Host(s) Idle Location
98 vty 0 idle 3d22h x.x.x.x
99 vty 1 idle 3d21h x.x.x.x
100 vty 2 idle 2d11h x.x.x.y
*101 vty 3 idle 00:00:00 x.x.x.z
Hi guys, I wanna disconnect telnet sessions 98, 99, and 100. How do I do it ? Thanks in advance.

Atif is quite correct that clear line is how to terminate those telnet sessions - once the problem has developed. And his suggestion that the problem be prevented by configuring an idle timeout is what I also recommend.
Looking at the idle time of these sessions certainly suggests that someone has configured the vty lines with exec-timeout 0 0 which disables the idle timeout. This has the effect that telnet sessions may go on for a very long time - and over a period of time hung telnet sessions may make all the vty ports busy and prevent remote access to the router. While I might not go as short as Atif's suggestion of a 5 minute timeout, I believe that the vty should have some timeout (perhaps quite long - especially in a testing or development environment). A vty with no idle timeout is a problem waiting to happen.
HTH
Rick

Similar Messages

How to recognize a telnet session (RF) from a SAPGUI?

hi guys,
i must check and block a transaction, developed for a RF terminal, if it is executed by SAPgui...
how to, in abap, recognize a telnet session (RF) from a SAPGUI ?
I have tried FM "SAPGUI_OBJECT_ID" hoping in a sy-subrc ne 0 with telnet but it's not right.
Edited by: Cacco Andrea on Apr 28, 2009 2:43 PM

i resolved like this:
    cl_gui_frontend_services=>get_computer_name(
      changing
        computer_name        = zterm
      exceptions
        cntl_error           = 1
        error_no_gui         = 2
        not_supported_by_gui = 3
        others               = 4
    if sy-subrc = 0.    "SAPGUI
else.               "telnet
    endif.

[SOLVED] Is It Possible to Create a Telnet Session in URXVT?

Greetings-
Just curious if anyone can tell me how to create a telnet session via rxvt. I saw a thread on here where someone said that it's possible, but I can't find any documentation on it. Just wanted to try it out to connect to my switch which I normally connect to from a tera term emulator.
Thanks guys!
Last edited by w201 (2013-10-03 23:57:02)

ewaller wrote:
Just run:
telnet the_address_of_your_switch
Or I missing something profound?
Well it was profound to me until you just showed how easy it is. The magic of learning eh?
Thanks.

How do I establish a telnet session with unit under test?

I am going to the next step as a novice and moving from serial communications to ethernet on my unit under test. I have been all over the help and discussion forums etc and cannot find an answer. I need to open up a telnet session with my unit under test and keep it open to send commands back and forth for control of the unit. Can anyone give me a hint of how I am to establish this communication? I have the IP address and I am using port 23 but I just get the session started and then immediately closed. The sequence of events will be: start the session, the unit will reply with a username and then password, after that I need the session to remain open so I can send commands as if I am sitting at the serial port. When complete the session will then be terminated. Thanks in advance for any help.

If you want to do telnet using plain TCP, you need to do everything yourself, including the telnet options negotiation.
RFC 854 should have most of what you need (look towards the bottom).
Most likely, the server will propose a few options, which you should either accept or reject depending on your needs.
Easiest is probably to use a packet sniffer on a regular telnet session, then dissect the negotiation to see what that particular server wants.
RFC 990 has a list of telnet options, look for the section labeled "ASSIGNED TELNET OPTIONS".
It should be simple to write some code that negotiates with one particular host. It will be more difficult to write a full-blown telnet client that does general negotiations with any type of telnet server.
I have a small program that telnets to a router to do some configuration. The only thing I reply to the proposed options is:
"\FF\FD\03\FF\FE\01\r\n" (In \-codes). Translated: "Don't suppress go ahead, Do echo".
(FF=IAC "Interpret as command", FD=Do, FE=Don't, 01=echo, 03= suppress go ahead.)
LabVIEW Champion . Do more with less code and in less time .

How to reconnect to a disconnected remote ssh session on solaris 10

hi all
How to reconnect to a disconnected remote ssh session on solaris 10
is there a way to accomplish this

No, there's not.
A common solution for this is to get a copy of 'screen'. After connecting via ssh (or any other protocol), you can start a "screen" session. If you get disconnected (or disconnect intentionally), you can later come back on the machine and bring your existing "screen" session back.
Darren

How can I send an F5 thru a telnet session?

I have to logon to a remote machine with a telnet session. To do this manually, I have to hit F5 to bring up the login prompt after the telnet session is established. I can establish the connection with LabVIEW, but how can I send the F5?

Telnet is essentially an ASCII-only protocol. There's no "F5" in ASCII, so you're probably supposed to send some sequence of ASCII codes to make it work.
Typically, text-based telnet programs emulate various kinds of physical terminals, such as DEC's warhorse "vt52" and "vt100" terminals, or the old ADM-3A. Those terminals sometimes had special keys that could send a sequence of commands. For example, I think the vt100 had an "F5" key that sent Escape (a byte containing decimal 27) followed by the letters "Ot". (I am looking at a UNIX box with an /etc/termcap entry for a vt100, and interpreting what it says. I'm not an expert at UNIX /etc/termcap entries, so I may be misreading it.)
Anyway, you need to find out what kind of terminal this remote machine
is expecting you to use. This will tell you what string to send for an F5 key.
I hope this helps.

How do I enable telnet links in FF8?

Following all of the previous links about adding UI handlers didn't work. I can't find any combination that will open a telnet session when a telnet:// link is clicked.
I get the "Firefox doesn't know how to open this address..." error.
Thanks in advance for any assistance.

Thanks.
These lines solved the issue:
gconftool-2 -s /desktop/gnome/url-handlers/foo/command '/path/to/app %s' --type String
gconftool-2 -s /desktop/gnome/url-handlers/foo/enabled --type Boolean true

Placing a telnet session within a java swing program

I was wondering if there was a way to maybe anchor a telnet session into a JPanel within a Java Swing program. Most of my users end up running a telnet session while using my Swing Program and I was hoping to find a way to bring the two together. If this is possible could someone point me in the right direction (like an online resource) that might show me how to do this.

You could use sockets and a TextArea and build your own simple telnet application.
Socket tutorial: http://java.sun.com/docs/books/tutorial/networking/sockets/index.html

How to use the telnet command line in Labview

Hi, someone can help me, I need to use a Telnet session in Labview but without using the http protocol, in this application I can only access the Telnet session using command line, here is an example of how I can access:
From my computer, click on Start, then Run and then type in CMD.
In the command line enter “telnet 192.168.0.1 5454” (without the quote marks) to bring up a blank DOS screen with a blinking cursor.
Type “AT” and press the ENTER key, you should receive an “OK” response.
Type in capital letters “AT+CMAR=1234” (without the quote marks)

I had a similar situation and here is what I did...
In MAX (Measurement and Automation eXplorer)
Select Devices and Interfaces
Select VISA TCP/IP Resources
Create a new resource
Select Manual Entry of Raw Socket
Enter the IP address and port (23 is the standard telnet port)
Give it a name. (VISA Ailas)
Now this "Device" will show up in the VISA drop down just like any other VISA device.
Use the VISA read and write just like you were communicating through a com port.
Since Telnet does not have a stop bit like serial, make sure you enable the termination character.
On your VISA reads set the number of characters to a big number, then VISA will read until it gets the termination character.
See my attached snippet of my Telnet read vi
Message Edited by RTSLVU on 06-16-2010 01:49 PM
Message Edited by RTSLVU on 06-16-2010 01:50 PM
Attachments:
telnet.png ‏40 KB
max1.png ‏33 KB
max2.png ‏31 KB

How to disconnect web folders?

I've created a webdav connection to portal using a web folder.
Unlike other network connections, I can't disconnect this connection. After a computer restart, the web folder still appears.
How to disconnect this webfolder?
I'm on portal 9.0.4.0.99
Client on windows 2000 professional SP3
Thanks,
Ton

hi ton,
my experience is that the webfolder connection gets disconnected when you either reboot the machine or you delete the cookie that holds the session information. with disconnected i mean that you have to reauthenticate the next time you try to access it. if you want to remove the connection you have to delete it.
maybe the microsoft windows forums / knowledge database have a more detailed explanation since this is purely windows related and has nothing to do with portal. portal is just a normal webdav server that accepts webdav connections from any webdav client.
regards,
christian

Java sniffer for a TELNET session

Hi
I need to interpret test results of a telnet session using a java sniffer..........how do I do this.
Thx
Frederd

I need to interpret test results of a telnet session
using a java sniffer..........how do I do this.You'll need to use two computers to do this, since Telnet uses a "well known port" to accept connections (look at www.iana.org for port number). Since only one process can hold a port, you'll need to run your telnetd on one machine, and have clients connect to another where your sniffer owns that port.
Once you've set this up, the sniffer itself is a simple pass-through portal: it accepts a request, makes a corresponding connection to the actual telnetd, then simply passes bytes from one connection to the other (logging them in the middle).

EM Grid-Control - Targets - Hosts - HOME - Open Telnet Session

Hello,
under
EM Grid-Control ->Targets -> Hosts -> HOME -> Open Telnet Session
i can possibly open a telnet session.
Can i change this to open a ssh session and how ?
regards
Frank

Sorry, Simple answer 'No'

Change Password via telnet session

Hi,
I would like to know how to change the tacacs enable password via telnet session.
When a new user login the first time via telnet, tacacs prompts the user with changing login password. However, it never prompts to change the enable password. Please advice.

I am not clear what your problem is. TACACS uses a single password for a user and does not distinguish an enable password which is different from the login password. TACACS will grant access to enable based on what is set up in the user profile (or group profile) not on having a separate password. The difference between a login password and the enable password is used by the router locally when the router is not able to communicate with the TACACS server.
So when TACACS prompts a new user to change the initial setup password, that is all that TACACS needs to do.
HTH
Rick

J2EE Connector JCA 1.5 and JMS to behave like a telnet session

Hi, I'm trying to develop an application that sends messages to cellular (SMS) through a gateway that works with a proprietary protocol.
A sample telnet session for sending messages works this way:
Me:
telnet server 8000
login:****
password:****
[I write some commands for setting up the way I am working, the connection use a proprietary protocol]
SendMode
Report=true
Server:
OK
Me: [now I send a new message]
Send
Dest=391241241
Body=Hello Everybody
Server:
MsgID=1254515 [a unique ID assigned by the server]
OK
Me: [send some other messages]
Send
Dest=28709217
Body=bla foo bar
Server:
MsgID=3097519
OK
[Now I stay logged in and when the status of a message changes the server notifies me with a message preceeded by"!"]
Server:
!StatusInd
!MsgID=1254515
!Status=in queue
![other informations about the message]
!OK
Me:
Logout
And the connection finishes.
I thought about resolving the problem with JMS because it was studied to resolve asynchronous message delivery, which is what I'm trying to achieve.
I think one solution could be the following:
1- my customer decides to send some SMS messages he wants to send through the interface I developed
2- a new JMS Message is created
3- a MDB wake up and performs the initial steps to connect throught native calls
4- new MDB wake up and, using the connection, send created SMS
5- another process use the connection to read the StatusInd and create a new JMS Message to describe the message status and registers it in a database
The main question is: how can I implement the "native calls"? Is there a way with the new Connectors 1.5?
But aboveall, does this API helps me creating an asynchronous message listener for StatusInd?
Another implementation doubt is that I must send a lot of SMS (around 4000 SMS in one action), so, in pass 4, should I create 4000 MDB instances? It should be a clean implementation, maybe this way I could use also correlation id/replyto headers in passage 5, but would it waste many resources?
Thank everybody, J2EE it's a huge infrastructure and I'd like to know if I'm moving the right way!:)
Andrea

Hi. It is possible to package native code along with a RAR. Further, in J2EE 1.4, it is possible to write MDBs that implement arbitrary message listener types, return values, throw exceptions, etc.

Setting the telnet session welcome note

Hello!
I wanted to ask you how to properly set the BANNER variable in the /etc /default /telnetd file, as a welcome note. For example, when I set the following in the file:
BANNER="SunOS 5.9, Solaris9"
The telnet session welcome screen then shows:
SunOS 5.9, Solaris 9 login:
Now I want that this login word appears after at least one or more lines, like this:
SunOS 5.9, Solaris 9
login:
Please help me out, how to set the BANNER variable properly spanning over multiple lines.

in vi editor you must insert 2 line feed characters and then a cariage return.
If you need to insert control characters in vi such as line feed or carriage return you must type Control-V then the next Control character for them to be recognized as control characters.
<Control-l>=linefeed
<Control-m=Carriage return
<Control-g=Bell
In your case it would be:
<Control-v<Control-l><Control-v><Control-l><Control-v><Control-m>

How to disconnect a telnet session ?

Similar Messages

Maybe you are looking for