SSH / Telnet Software

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.

Share tech news, updates, or what's on your mind.

Sign up to Post

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
Announcing the Most Valuable Experts of 2016
Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Dear All

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

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
P3: 58f3d47d
P4: StackHash_c1e2
P5: 10.0.14393.0
P6: 578997b2
P7: c0000374
P8: PCH_BC_FROM_ntdll+0x00000000000A59A4

Attached files:

These files may be available here:

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.
Able to take telnet of the server and unable to take ssh.

  I am having a problem with an SSH connection.    I have a user program connecting to a device like below

    USRPRGM  SSHMODULE  ------->   SSHD    SERVER     TELNET  ----->    DEVICE
              Windows 7 PC                                SOLARIS Unix server                   Proprietary Device

      So the user program opens an SSH Shell using an SSH Module to the solaris sshd server and logs in.
      At the shell prompt the user program issues a TELNET command to make a connection to the DEVICE.
     This ends up as a tunnel between USRPRGM and DEVICE.

     "SO why not use SSH Tunneling to create the tunnel?   My customer who owns the Solaris Server will
not allow TCP Port forwarding with SSH."

      As part of the protocol, the user program sends  $  ACK $ to the device.
A log of the user program shows that the user program received back   $ ^ F $.  (THE ACK CHARACTER IN HAT NOTATION)
I was also able to work with the customer and perform a SNOOP on the telnet side.
Surprisingly, the $ ACK $ was never sent out the telnet port to the device!!!!!!!

   Ok so after doing some reading, I see that a unix style SHELL does/can interpret
many characters as meta-characters.   For example * [ ] ^ and of course $ to name a few.
So I tried issuing the command stty raw,    then wait for the prompt,   then issue the telnet
command.    This test failed, the telnet application on the server never started.    My
user program log shows,  the telnet …
Hi all,

I have installed Tectia client on two client machines installed with Windows 2008 R2. Tectia client comes with an executable scpg3.exe to copy file to a remote host securely.

I am using the public key method for authentication. I notice that on machine A the file copy to a remote host server with SFTP server installed takes around 3 seconds to complete

ON another machine B, I have tried that the file copy to the same remote host server (using the same file) takes a much longer time to complete (~10 seconds). It seems that the authentication takes around ~8 seconds from machine B.

Please advise the possible causes. Thanks.

What AWS values do I need in order to use SSH on an AWS Beanstalk EC2 instance?

And how are these values used in an SFTP/SSH client on Windows 7?
I am trying to run a mulesoft application that ftps a file to a host using jsch. We have an identity file in the windows server where I am running the application.
                        JSch jsch = new JSch()
                  session = jsch.getSession(user, host ,port)
                  Properties config = new Properties()

However, when the code hits session.connect(), I am prompted for Kerberos username [xxxxx]: in the anypoint studio console. And the username xxxxx prompted is the username used to login to the windows server that wuns the application. The user in  jsch.getSession(user, host ,port) is a windows service name and is different from the xxxxx.

This code works fine in the mulesoft server where it is deployed. We are trying to get a development environment ready.
I have installed a virtual box and set up two vms on it. I also installed vagrant to manage the boxes and images.

I brought up one machine by command "vagrant up" and whenever I ran "vagrant ssh" command, I only connect to the second machine.

How could I choose the vm that I want to ssh easily?

below are the commands that I tried.

jyu@NBW7BREYUJ /cygdrive/c/Users/jyu/dotCMS_CentOSwithDocker
$ vagrant box list
CentOS6.4withChef         (virtualbox, 0)
nhalm/centos7-gui         (virtualbox, 0.1.0)
williamyeh/centos7-docker (virtualbox,

jyu@NBW7BREYUJ /cygdrive/c/Users/jyu/dotCMS_CentOSwithDocker
$ vagrant status
Current machine states:

default                   running (virtualbox)

The VM is running. To stop this VM, you can run `vagrant halt` to
shut it down forcefully, or you can run `vagrant suspend` to simply
suspend the virtual machine. In either case, to restart it again,
simply run `vagrant up`.

jyu@NBW7BREYUJ /cygdrive/c/Users/jyu/dotCMS_CentOSwithDocker
$ vagrant vbguest
Guest-specific operations were attempted on a machine that is not
ready for guest communication. This should not happen and a bug
should be reported.

jyu@NBW7BREYUJ /cygdrive/c/Users/jyu/dotCMS_CentOSwithDocker
We have an FTP server but are now being asked for a SFTP setup.  We've locked down our FTP server so the vendor or whoever needs to access it can only access that server and nothing else on our network but I'm assuming that when data is transferred, it transfers in plain text.
This may be a stupid part to this question == if someone is transferring data using something like FileZilla and the FTP server isn't a SFTP server, can they still choose to use port 22 (the SSH port?
If not, can someone point me to some documentation on how to set up SFTP on our FTP server?
On Demand Webinar: Networking for the Cloud Era
On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

Hi all...

Need to integrate with Ubuntu and other Linux systems. Basically, I would like to pass AD credentials on the network to a Linux system integration. I hope my question makes sense and looking forward to any ideas out there.

how to download Recording files from UCCX10 using SFTP step by step?
Greeting Experts,

This question is a bit open ended, but what do you all think of TeamVeiwer usage and security concerns?  Also, if you feel it is an unsecure solution, what do you feel is the best secure alternative?  Cost is not a factor.
I know I can see the telnet commands that correspond to the gui in asdm but I can't figure out how. Can someone tell help me?

I have a Cisco 1921 Router that I'm trying to shutdown SSH On the WAN Interface on.  I still want to get to the LAN side interface with SSH.  I've created an ACL for it, but not sure if it's correct, and would appreciate some help on whether I've configured the ACL correctly, and a correction if I have it wrong

Thanks in Advance on this.  Here's what I have:

ip access-list extended BLOCK_SSH
deny tcp any any eq 22
permit any any

interface gig 0/0
ip access-group BLOCK_SSH in


We have several Sonicwall firewalls installed at various client sites. We are moving from one smarthost provider to another, and we would like to continue to limit inbound email traffic to specific IP addresses, subnets, etc. with the new provider. Since there are numerous entries we need to make on each Sonicwall, is it possible to create a script to push them to an individual firewall all at once? We usually use the GUI, and just recently realized the CLI is available via SSH. Based on a lack of SSH CLI scripting experience, much like the GUI, we can apply settings individually, which doesn't save any time and actually takes us longer than doing it via the GUI. We would appreciate some feedback on if it is possible to script these settings, or if we just need to apply the settings one by one on each Sonicwall. And if it's possible, we're going to need some step-by-step guidance on scripting via SSH.


I tried to copy a folder from one instance to another instance on AWS, but got the following prompt.

root@monitor:/data/lib$ scp -r jenkins root@
The authenticity of host ' (' can't be established.
ECDSA key fingerprint is b8:f1:24:56:6d:50:20:af:89:d3:af:a1:a1:a8:d2:4f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '' (ECDSA) to the list of known hosts.
Permission denied (publickey).
lost connection

I think it's because of public key. The destination server is a brand new server without running ssh-keygen command. What shoud I do to make the scp happen?

Hello. I am trying to access Elastic Search Server on AWS.
1. What would the ssh be to access the Elastic Search Server?
2. Once I am able to access it where would I place a python script in order to feed data into the Elasticsearch server?

I tried

PS C:\Users\hpBill> ssh root@search-wbcelastic-*******
but just get this:

ssh.exe": search-wbcelastic-********** no address associated with name
I have this information
Domain status
Domain ARN
Hello all,
I need to configure on putty/puttytray, in windows a double hop with a dynamic port.
how can I do that?
thank you very much
best regards
Free Tool: Subnet Calculator
Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

I am running Docker 1.11.1 in the cloud (using digital ocean). I access it through SSH but I am not familiar particularly with Linux and so I was wondering if I can access it through a desktop interface instead of the command line.
I want to run some python scripts inside it. Anyone have any suggestions? I tried to install Teamviewer but it seemed not to work.

root@docker-test:~# ls
teamviewer_i  teamviewer_linux.deb  teamviewer_linux_x64.deb

root@docker-test:~# sudo dpkg -i teamviewer_i386.deb
Selecting previously unselected package teamviewer.
(Reading database ... 87950 files and directories currently installed.)
Preparing to unpack teamviewer_i386.deb ...
Unpacking teamviewer (11.0.57095) ...
dpkg: dependency problems prevent configuration of teamviewer:
 teamviewer depends on libc6 (>= 2.4).
 teamviewer depends on libgcc1.
 teamviewer depends on libasound2.
 teamviewer depends on libdbus-1-3.
 teamviewer depends on libexpat1.
 teamviewer depends on libfontconfig1.
 teamviewer depends on libfreetype6.
 teamviewer depends on libjpeg62.
 teamviewer depends on libpng12-0.
 teamviewer depends on libsm6.
 teamviewer depends on libxdamage1.
 teamviewer depends on libxext6.
 teamviewer depends on libxfixes3.
 teamviewer depends on libxinerama1.
 teamviewer depends on libxrandr2.
 teamviewer depends on libxrender1.
 teamviewer depends on libxtst6.
 teamviewer depends on zlib1g.

dpkg: error processing package teamviewer (--install):
 dependency problems - 

Open in new window

I am trying to connect to a raspberry (linux computer) using libssh in visual studio and C++.
This is the code I use:

#include "libssh/libssh.h"
#include <stdlib.h>
#include <stdio.h>

int main()
  ssh_session my_ssh_session;
  int rc;
  char password[]="raspberry";

  // Open session and set options
  my_ssh_session = ssh_new();
  if (my_ssh_session == NULL)
  ssh_options_set(my_ssh_session, SSH_OPTIONS_HOST, "");
  ssh_options_set(my_ssh_session, SSH_OPTIONS_USER, "pi");

  // Connect to server
  int verbosity = SSH_LOG_PROTOCOL;
  ssh_options_set(my_ssh_session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);

  rc = ssh_connect(my_ssh_session);

Open in new window

But rc is always -1
I tried to add that:

ssh_options_set(my_ssh_session, SSH_OPTIONS_KEY_EXCHANGE,"diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1");

Open in new window

and/or that:

ssh_options_set(my_ssh_session, SSH_OPTIONS_CIPHERS_C_S,"aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-ctr,arcfour,arcfour128,arcfour256");

Open in new window

But I still get that error (or similar):

crypt_set_algorithms2: no crypto algorithm function found for 3des-cbc

I precise that I can connect with putty without problems.


I have the following inside my Vagrant file. "private_network", ip: ""

When I "vagrant up", vagrant is assigning I'm not sure what's causing this. Below is the full trace.

$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Clearing any previously set forwarded ports...
==> default: Fixed port collision for 22 => 2222. Now on port 2200.
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
    default: Adapter 2: hostonly
==> default: Forwarding ports...
    default: 22 (guest) => 2200 (host) (adapter 1)
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address:
    default: SSH username: vagrant
    default: SSH auth method: private key
==> default: Machine booted and ready!
==> default: Checking for guest additions in VM...
==> default: Configuring and enabling network interfaces...
==> default: Mounting shared folders...
    default: /vagrant => C:/vm2
==> default: Machine already provisioned. Run `vagrant provision` or use the `--provision`
==> default: flag to force provisioning. Provisioners marked to run always will still run.

Please, when I login to Linux server I did not get my usaer@server. instead, I only got   >.  I mean I should get [user@host]:~> but I only get >. and I can not use command computeuse. it returns an error. also, after that, I try to connect from that machine using ssh user@host. it connecting but I got after name $ sign and I can not run any application. I mean I got [user@host~]:$

any help

Hi, I have a user with a public key and I need to install it on a new linux debian server.

How do I do this.

I need to basically add his key to a user called appserve
So I was trying to enable snmpv3 and managed to lock myself out of web and ssh access. Clearly I've broken something but I am hoping someone out there maybe able to assist in resolving the issue..

I've tried connecting via serial - it connects but no menu, nmap tells me 22 and 443 are still open..

Any help muchly appreciated..


SSH / Telnet Software

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.

Top Experts In
SSH / Telnet Software