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SSH / Telnet Software

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Telnet is an application layer protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection. SSH was designed as a replacement for Telnet and for unsecured remote shell protocols. The term telnet is also used to refer to the software that implements the client part of the protocol. SSH provides a secure channel over an unsecured network in a client-server architecture, connecting an SSH client application with an SSH server.

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We have a vendor who has put his linux based appliance behind a firewall. If I ssh to the system from the same subnet as the linux appliance ssh succeed - giving me a login prompt and then succeeding with authentication. If I login to the linux appliance from the Outside of the firewall the conversation succeeds apparently - I get a login prompt. But when I enter the same credentials the connection is promptly terminated. If I look at the firewall I see only the allowed SSH session and no other denies to the server.
Any idea what might be going on? What logging could be looked at on the linux appliance to give us insight as to why the ssh connection is failing in the second case? Thank you
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like a full clone in VMWARE , is there a way to do this?


thanks
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0 Comments
I am having this issue that I have ( I think ) trased to an AMAZON ami that has changed and does not allow SSH anymore

can I access an older version of an AMI ????


CentOS Linux 7 x86_64 HVM EBS 1602-b7ee8a69-ee97-4a49-9e68-afaee216db2e-ami-d7e1d2bd.3 (ami-6d1c2007)

west coast AMI

(cannot SSh)


CentOS Linux 7 x86_64 HVM EBS 1602-b7ee8a69-ee97-4a49-9e68-afaee216db2e-ami-d7e1d2bd.3 (ami-af4333cf)
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I have identical configs for the east and west coast , I have launched 30 or so of centos images , PPK,PEMs all in place all was working .

I added Centos AMI's to the US_WEST and cannot SSH into them"connection Refused" now I go back to the US-EAST and cannot SSH into them at all , all ports are open the security settings are all the same .


is there a limit to how many instances we can ssh into or something I am baffled about this ?

please help this is a production type issue ( giving a class )


how can I get more logs on the "connection refused" error


thanks
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8 Comments
Hello,

I am new to ssh proxy command, we are trying to connect to the remote server and it is closing after this.

penSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Executing proxy command: exec ssh -q -W mokkan3:22   mokkan2
debug1: permanently_set_uid: 0/0

I  need to go to server mokkan1 to mokkan3 using mokkan2 as  proxy server,
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1 Comment
Hi,

Hi, I'm using Copssh 5.0.0.9 version and it's works fine so far. i face an issue like "error: Received disconnect from
x.x.x.x: 14: No supported authentication methods available [preauth]". (Note: This is from Copssh Events log)

When i try to pull from files from server using TortoiseGit.

"Disconnected: No supported authentication methods (serversent: keyboard-interactive)"

Could you please help me, to solve this?

Thanks in advance
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0 Comments
Hi Experts,

1. In what kind of environment , would we need to manage SSH keys?  
   Is it when we have multiple users sshing into any network device/Servers ?

2. Is there any software , that can be used to centrally deploy  different SSL certificates , and manage them (as in inform the admins about the date of expiry , etc.)


Thanks,
T
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7 Comments
Hello Experts,

We are remediating security vulnerabilities.  I have several Ricoh MP 401SPF printers in our environment.  One of the vulnerabilities found was open TELNET.  I want to enable SSH and disable telnet.  I go into the printer interface and setup SSH as follows:

Ricoh1.png---Paint.png
When I try to SSH into the printer, I get the following error:

Ricoh2.png
When I look at the logs, I'm not seeing much that will help me.  Here are the logs:

Ricoh3.png
I've googled the error and have not come up with much.  I've deleted the key and recreated it.  I've also tried different clients.

Does anyone have any ideas?

Thanks,
Nick
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1 Comment
Is there a simple and easy way to uninstall Drivers attached to Com ports?

My putty keeps crashing. Probably because I've installed several different serial to USB cables on my laptop
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3 Comments
Hi,
How to identify the reason of problem below?
Status:	Connecting to 160.96.17.69...
Response:	fzSftp started, protocol_version=8
Command:	open "pzim_ftpuser1@160.96.17.69" 22
Error:	Connection timed out after 20 seconds of inactivity
Error:	Could not connect to server
Status:	Waiting to retry...
Status:	Connecting to 160.96.17.69...
Response:	fzSftp started, protocol_version=8
Command:	open "pzim_ftpuser1@160.96.17.69" 22
Error:	Connection timed out after 20 seconds of inactivity
Error:	Could not connect to server

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7 Comments
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I am running ubuntu 14.04.4 LTS \n \l  on a virutal machine.

Up until about 1 hour ago, I was able to SSH into my linux box just fine internally, in my network.
I did a sudo ufw disable, sudo reboot and then i just enabled back the firewall, sudo ufw enable, did a reboot,
and now I can't SSH into the server.

Any idea's what I have to do to fix the issue and allow the linux box to accept SSH?

I can get into it via the console.
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1 Comment
Here's a useful replacement for SSH. I never really gave much thought to UDP vs TCP for staying connected while roaming on a mobile device. https://mosh.org/
Mosh: the mobile shellMobile shell that supports roaming and intelligent local echo. Like SSH secure shell, but allows mobility and more responsive and robust.
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0 Comments
Hello Experts,

I have number of HP blade enclosures to pull data from.  I've written a Python script to SSH to the enclosures and retrieve the data.   The script works but takes about 3 hours to complete.   Although the bulk of the code in the script parses the data, the bulk of the time involved is in setting the SSH session to each server.   Thus what I'd like to do is establish a means to run the processes in parallel.    I'm hoping someone can give me pointers in the right direction.

What I've Tried

1. My first stab at this with with the Parallel-SSH module (https://pypi.python.org/pypi/parallel-ssh).   That would have been the cleanest solution.   However, although I was able to connect to my enclosures, I was unable to retrieve output from any of my commands.  
2.  My current work around is to use Python's Multiprocessing module and specifically a pool as that seemed to be the simplest solution.   However, that's not working.   From the output the use of pool.imap results in mangled IP addresses.  Consider the following:

('OA IP is: ', u'1')
Now Processing OA 1.
Cannot connect to OA: 1.
[Errno None] Unable to connect to port 22 on 0.0.0.1

Here are some code snippets
def automatic_mode():
    enclosure_results_lst = []
    try:
        enclosures_lst = get_chassis_data() 
        # Function pulls IP addresses from another systm
        # Function return a Python list.  Example below
        # enclosures_lst = ['10.0.0.1', '10.0.0.1',

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…
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5 Comments
Hi expert

I had encountered the followng error "showing too many parameters for command synchronize".

i have the attach the script files  for reference example

option batch abort
option confirm off
open sftp://test1:test@200.1.1.1 -hostkey="ssh-rsa 1024 e4:dd:11:2e:82:34:ab:62:59:1c:c8:62:1d:4b:11:11"
synchronize local E:\SIN\Marketing\Daily Reports  /Reports

please note I have attached the errors message for your reference.
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2 Comments
I am setting up spiceworks monitoring on my domain and "one" computer it cannot connect. I already opened the ports on the domain and in the firewall (Symantec) but still cannot connect.
I did a telnat but it shows ports listening that is not required in their documentation.
Is there a network tool that I could use to monitor to see what is blocking the server application to communicate with client
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7 Comments
We have an account that when someone SSHs in to it won't accept a password. If I login via Putty and su to the account I get asked for the password and when I put it in it's accepted. If I ssh to that account I'm asked for a password and it is rejected.

Hasn't been any real changes to the OS/Server but I'm not an Unix  pro. Where should I start?

Yes, I can delete and recreate it but I'd like to find the underlying issue.
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7 Comments
I am new to ssh and I have no idea what I'm doing. I followed the instructions on public and private key generating, and all that grand stuff, but when I open terminal on my mac, I get this. What am I doing wrong?
Screen-Shot-2017-07-21-at-4.14.32-PM.png
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3 Comments
Hello,
I have powershell code for winscp that uploads files from a local directory using a filter on files in the directory to a remote server.  I need code to determine if files are in use before they are uploaded. If a particular files is in use, I would like the code to skip the upload of that particular file and continue with the upload of the files not in use.  The code needs to accommodate applications that might be using the file that do not support file handles and any process that might have a lock on the file.

Any help would be greatly appreciated.

Thank you
Diammond
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5 Comments
Dear All

           I have a CentOS 7 suddenly can not ssh to it, below is the error, any idea what happen ?

ssh
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8 Comments
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Previously Bluecoat proxy allows access to SendThisFile service but sometime in
May, Bluecoat proxy has blocked it as "potential data loss/leakage".

I can see that SendThisFile has options for files transfer via PCs/laptops/emails
though previously when I could access, they have good encryptions etc.  Don't
recall SendThisFile is HIPAA & PCI certified.

What about IPSwitch (refers to link below):
https://www.ipswitch.com/resources/data-sheets/ipswitch-gateway
It's PCI & HIPAA certified but what else sets it apart from SendThisFile that it's
not a potential data loss/leakage source?  Some major insurance companies
want to exchange files with us using IPSwitch.

What I can think off are whether IPSwitch can restrict such that:
a) use only sftp that IPSwitch offers, not ftps (correct me, but I believe ftps is
   less secure than sftp)
b) don't allow transfer via PCs at both sender/recipients ends but this is
    something controlled at recipient/sender's ends right?  Not by IPSwitch
    or unless IPSwitch has an option that restricts connections from servers
    IP addresses of senders & recipients - does it have this option?
c) how is IPSwitch PCI certified?  They mask their customers data or have
    segregation of different customers (ie no co-mingling)?
d) how else can we restrict such that sender/recipient do connect from
     public places & homes of their staff but only from their organizations'
     servers?
e) I suppose we should not allow …
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2 Comments
Hi,

I am using secureCRT version 8.0.4 on windows 10. Whenever I ssh into any of the devices, there is no terminal length set for example when i ssh into cisco router and give a command of Show Run it displays the whole configuration instead giving breaks i.e.--more-- in the middle like in putty.

How can i achieve the same using secureCRT?
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2 Comments
I have many winscp ftp website, login, password
Rather than me looking through email, and sms to figure out what the passwords are,

how can I backup the passwords in a file
and use that same file to restore in a new windows 10 computer
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2 Comments
I found a really nice looking example of how to do telnet over VB.  

It is the last post on this page:

http://stackoverflow.com/questions/9113632/test-telnet-communication-on-remote-computer-using-vb-net

It looks to be exactly what I need, but I don't know how to use it.  

I want to use it to connect to cisco routers and issue commands.  

I've built a form to do it, but, I have a really silly problem.  I don't know how to instantiate the class, set the settings and use it!

I don't do a lot of VB and this bit has stumped me.  

Ideally, if you checkout the code below and assuming it is ok,  tell me how to:
1.  Connect to a telnet device using the hostname from a textbox called txtHostRouter and the port number from a textbox called txtPortNumber
2.  Recieve whatever output (probably a password prompt)  into a text box called txtOutput.  
3.  Send some input from a text box called txtInput for example "show Run"
4.  Recieve the output into a different text box called txtOutput.  

So I can keep doing 3) and 4) until I am finished and then close the connection.  

I am not sure where to start, so even if you just get me started, I bet I can work it out.  

I have pasted the code below

Any help would be appreciated

Thanks in advance

Imports System.Threading
Imports System.IO
Imports System.IO.Pipes

Public Class TelnetClient

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11 Comments
I am configuring OpenSSH on windows, when I sftp a number of files through winscp the following error is logged and the transfer fails.

Fault bucket 120742644444, type 4
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: sshd.exe
P2: 0.0.12.0
P3: 58f3d47d
P4: StackHash_c1e2
P5: 10.0.14393.0
P6: 578997b2
P7: c0000374
P8: PCH_BC_FROM_ntdll+0x00000000000A59A4
P9:
P10:

Attached files:

These files may be available here:
C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_sshd.exe_22ea82deddc0bc295fdb7f2a9ebb7d12a9daedd_01be728d_1f386bfb

Analysis symbol:
Rechecking for solution: 0
Report Id: df3f0593-ed53-412b-8d6f-bc3fd55c42df
Report Status: 0
Hashed bucket: 7e077c76baf60d7e7a72f62d6b43bfe1

I have tried to disable the Microsoft DEP but I am still stuck with this error.
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2 Comments
Sys admin has provided me username and password and advised that solaris uses nis (and then I've been given hostnames).

I've downloaded putty but it gives me authentication failure. Nothing special I have to do if its NIS authentication?
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1 Comment

SSH / Telnet Software

2K

Solutions

6

Content

i
The collection of articles, videos, and posts on this topic.

3K

Contributors

Telnet is an application layer protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection. SSH was designed as a replacement for Telnet and for unsecured remote shell protocols. The term telnet is also used to refer to the software that implements the client part of the protocol. SSH provides a secure channel over an unsecured network in a client-server architecture, connecting an SSH client application with an SSH server.

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