SSH (Secure SHell) is a protocol for running commands on a remote computer.

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“PTY allocation request failed on channel 0 stdin: is not a tty” when SSH'ing into a Debian server

My hosting space (Debian Wheezy) serves two websites (one WordPress and one Rails). Today I saw both were down and I rebooted the server. The Rails site works again and the WordPress one now says that ...
2
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2answers
179 views

Characters are encoded twice when I ask SSH to reattach a screen session on the remote host

I want to be able to SSH to a remote host and restore a screen session with one command. Both hosts use UTF-8 locale. My problem is that then, inside the screen session, characters are encoded twice. ...
3
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1answer
552 views

How do you verify if an INCOMING ssh tunnel is still up and who it belongs to?

See edit below for short version I am having issues displaying the status of the ssh tunnels on our server. Here is some relevant info: user001 = remote client's username 123.123.123.123 = ssh ...
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2answers
1k views

New users cannot connect to server via SSH

An SSH server using RSA keys for authentication is running on Ubuntu 14.04. My original account can connect to the server using SSH (PuTTY). However, the following issue occurs: Disconnected: No ...
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3answers
9k views

Using nohup to keep a script running indefinitely

I am very new to Linux and I've only been using it to SSH to my web server using Putty. The issue I am having is this: Basically I've got 2 php scripts. One get_tweets.php constantly listens for ...
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1answer
1k views

How do I troubleshoot ssh tunnels disconnection?

I am using SSH tunnels launched via autossh at boot on a device installed at remote locations. Up to now everything was working fine but yesterday the connection partly went down and autossh wouldn't ...
1
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1answer
1k views

VNC & SSH : local (win-putty) -> hop (linux) -> remote (linux)

I'm gettin a headache trying to access a remote VLC & SSH. This is the situation : Local : Win box behind NAT, dynamic IP. I want to connect from here. Hop : Linux box, static IP server Remote :...
3
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2answers
124 views

Shell loses keypresses when running SSH in the background

I'm experiencing a bizarre problem with SSH + Bash + Terminal.app: when SSH is run in the background, the shell appears to randomly lose keypresses ~50% of the time. For example, if I run: $ ssh -N ...
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1answer
715 views

Identify the outgoing connection (ssh) with the who command

After a ssh connection, if I run the who command on the server : I have this response : olivia@olivia-pc:~$ who olivia :0 2014-09-08 11:40 (:0) olivia pts/0 2014-09-08 11:43 (:0)...
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0answers
413 views

Cannot SSH after switching to Netgear router

I have Comcast Xfinity internet. When I was sent their Wifi router/Cable modem combo box, I was able to use SSH perfectly. However, since the Wifi from the box was weak, I decided to buy my own router:...
3
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0answers
203 views

Operation timeout (in /var/log/secure)

Sometimes when connecting via ssh to my RHEL server, I get the following message back from the client: Operation Timeout Seems like a network problem, but when I look at /var/log/secure on the ...
1
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1answer
503 views

Avoid trapping by ssh ProxyCommand

I have the following lines in my .ssh/config: Host localhost ProxyCommand none Host n0* ProxyCommand none Host * ProxyCommand corkscrew proxy.m.com 80 myserv 443 ~/.ssh/auth i.e. for localhost and ...
14
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3answers
2k views

How to tell if SSH'd into machine? [duplicate]

Is it possible to tell if a terminal is SSH'd into a machine ? some kind of command to do this for me and execute something if I am SSHd?
3
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3answers
209 views

SSH - Is it possible for an SSH session to take complete control of the client? [duplicate]

When I open a SSH session on my terminal to a remote server, is this only a virtual terminal, or is it possible for the SSH server that I am connected to to "take control" of my terminal? For example, ...
1
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1answer
85 views

SSH key-only remote login, is disabling password a good practice?

I need a maintenance user which only requires a remote login. I'll preferably use only public keys to login into the account. I thought of just creating the user with useradd myuser, adding later the ...
4
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2answers
724 views

Run `dbus-send` in a remote system

I'm trying to run dbus-send in a remote system but somehow I'm not able to run it. But the same dbus-send, if I run it in the local system, is working fine. COMMAND: ssh remote@xx.xx.xx.xxx "dbus-...
6
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1answer
1k views

How do I stop ssh-agent trying all keys with agent forwarding?

Often I'll connect via SSH to VM instances to deploy code from private Bitbucket repositories, cloning repositories via git over SSH. Today I was getting the error: conq: repository access denied. ...
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0answers
2k views

Load a background image or set the background color if Konsole/Shell is running SSH

I want to set my laptop to load an image in the shell's background or set the background color to red if I'm connected via SSH. How can this be done? With a bash function in .bashrc? I have: Set the ...
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0answers
221 views

xvfb-run aborting on cluster

I'm trying to run a python script with xvfb-run on a cluster using SLURM; when I use an interactive session (srun) it works fine, but when submitting to a queue (sbatch) it aborts/fails without much ...
1
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1answer
132 views

How does ssh server defines which key to use first having more than 1?

I have just found out that on my Ubuntu machine I have more public keys to serve in /etc/ssh directory: $ ll /etc/ssh total 296K -rw-r--r-- 1 root root 237K lip 3 2013 moduli -rw-r--r-- 1 root root ...
0
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4answers
125 views

Backup remote management protocol in case of faulty SSH server

I have a remote computer which I currently cannot access with SSH. The computer responds to ping but SSH gives connection refused, so I suspect the ssh-server is not working for some reason. What ...
3
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1answer
2k views

SSH Public Key authentication - works only after a physical login

I am trying to connect via SSH to my ubuntu server with public key authentication. For some reasons I get an "Permission denied (publickey)." on the client, whenever I execute ssh -i ~/.ssh/id_rsa &...
2
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2answers
155 views

How can I run ssh-add on demand? Can it act as SSH_ASKPASS?

I want to ssh from user@local to user@remote several times per day with an encrypted SSH key, a situation which ssh-agent handles with a good trade-off between security and usability. I'd also like ...
1
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1answer
635 views

Sourcing bashrc file fails with ssh -t

ssh -vvv -F /home/me/.ssh/config serva -t "source ~/.bashrc" This is the output I get when I use -vvv flag: debug1: Authentication succeeded (publickey). debug1: channel 0: new [...
2
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2answers
3k views

I want to suppress “no access to tty” error message?

I have a bash script where I use ssh to connect to another server and run some commands there. I found some sites that the error (Warning: no access to tty (Bad file descriptor). Thus no job control ...
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2answers
3k views

Why can't I use public/private key authentication with ssh on Arch Linux?

I have the following setup on an Ubuntu machine: ~/dotfiles/authorized_keys2 ~/.ssh/authorized_keys2 -> /home/wayne/dotfiles/authorized_keys2 I had the same setup on my Arch machine, but when I ...
10
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1answer
2k views

Can I move a running application to a different X server?

Is there any way to open a graphical program (for instance, gedit) while using X11 forwarding over SSH and transfer the X server connection back to the X server on the SSH host?
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2answers
1k views

Stop ssh config on first match

I have a added a local proxy for all my hosts in my .ssh config, however I want to shell into my local vm without the proxy command. Output of my ssh attempt: debug1: /Users/bbarbour/.ssh/config ...
0
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2answers
455 views

Login by ssh , exec one command and i don't want to quit the bash

I want to change PS1 when i ssh another centos strshell = 'PS1="remote!"' os.system("ssh -i %s -l%s -p%s %s %s"%(SSH_KEY,SSH_USER,SSH_PORT,des,strshell)) ssh quit automatically. I want to ...
0
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3answers
266 views

after ssh login and during apt-get update, is it wrong to suddenly logout?

there's a raspberry pi that I ssh logged into it works fine and then I sudo apt-get updateed it. during the process, I just turned off the terminal thinking that the update process should be running ...
3
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0answers
323 views

Kerberos Forwarding in SSSD

So, I'm trying to set up forwarding with Kerberos and seem to have some problems. On some of my servers I'm able to forward after receiving a ticket; however, some I'm not. My system setup is a ...
3
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0answers
597 views

Server freezes because of fail2ban

Lately I've experienced some problems with my server freezing or having network problems (I can't really tell which at this point). I'm running OpenSSH on port 443 and it seems fail2ban's anti SSH ...
24
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2answers
2k views

Why is this binary file transfered over “ssh -t” being changed?

I am trying to copy files over SSH, but cannot use scp due to not knowing the exact filename that I need. Although small binary files and text files transfer fine, large binary files get altered. Here ...
1
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1answer
327 views

Copy newest file in directory over SSH

How might one copy the newest text file from a particular directory on a remote server to his local machine? On the server itself I can do the following: $ cat `cd /home/user/dir ; readlink -f $(ls -...
37
votes
9answers
168k views

ssh_exchange_identification: read: Connection reset by peer

I am on OS X trying to ssh into a ubuntu 12.04 server. I was able to SSH in -- until abruptly stuff stopped working. I've read online to use the -v to debug this. Output is shown below. If I ssh into ...
4
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2answers
424 views

Transfering content of block devices

For the purpose of backups, I'd like to transfer (several) whole disk partitions over an ssh link. So the source is a block special device, and the target should be a regular file. Common tools seem ...
5
votes
5answers
24k views

Script to ssh and run a command doesn't work

Below is the script. I wanted to login several servers and check for the kernel version. #!/bin/bash #input server names line by line in server.txt cat server.txt | while read line do sshpass -p ...
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1answer
1k views

Terminal colors putty raspbian

I'm connecting to my Raspberry Pi from my Windows Machine using putty. I already adjusted the colors for bold blue in putty to be more readable (using this guide). But I still have problems with the ...
0
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2answers
87 views

Connect to a remote linux server that is in default setup, not configured to be connected?

In our Company we have an internal-wikipedia-like help site. The Problem is, the MindTouch-Wiki is out of date, so i have to update it! The Problem is, its running virtual. Its Ubuntu 7.7 In ...
2
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3answers
6k views

How to send a output of unix command from one server to another server?

How to redirect the output of a unix command from one server to another server. I should be able to send the unix command's output from server-1. Then I should be able to receive the output in Server-...
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0answers
675 views

How to setup ssh over USB on an embedded linux device?

I have an embedded linux device with an ARM processor. I am connecting to it over a USB port using minicom. What should I do to "ssh" into the device through the USB connection? I want to setup ...
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4answers
1k views

How can I run a GUI on my server through SSH? [duplicate]

Most people want to be able to forward a window through ssh to the machine they're logging in from. I want to do the opposite. I'm on my desktop and I'm logging in via ssh to my server. The server is ...
4
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6answers
701 views

Use a shell not installed on remote machine

Given the scenario: Remote machine: SSH server; user does not have admin privileges; Local machine: SSH client; user has admin privileges. If user, logging in to remote from local, wishes to ...
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2answers
33k views

What is the default idle timeout for OpenSSH?

I can't seem to find an answer to this simple question, which I need for some compliance documentation. On a default install of CentOS 6.5 (OpenSSH 5.3p1-94.el6), after how long of being idle will ...
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2answers
292 views

How to use private-key to setup password-less ssh on new machine

I have one machine say source1 and there is passwordless ssh already set to more than 100 server say remote1, remote2, ...remote100. Now I need to set similar setup of passwordless ssh on another ...
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0answers
121 views

How does ssh work when client and host are on the same machine? [closed]

I illustrate my question with the help of docker containers but this example is orthogonal to the rest of the problem. In fact any program that allows the use of bridge interfaces and ssh would do. I ...
2
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1answer
84 views

ssh to different server based on user?

Is there a simple way to have my router forward ssh logins for certain user names to a different server on my internal network? For example, ssh router@url would log me in as router on the router and ...
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1answer
94 views

Accidentally garbled a bunch of file names in /tmp… ssh keys asking for passwords

I accidentally garbled the file names of the contents of my /tmp directory (don't ask) to the point where they're not recoverable. Since doing so, I'm always asked for the password to my ssh keys (...
0
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2answers
244 views

How to enable passwordless auth to remote server as a different user?

This may seem quite trivial but what I've done doesn't seem to solve the problem. I'm connecting to a remote server as tom who (obviously) exists on the remote server but not the local server. I ...
4
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2answers
116 views

Inconsistent redirection behavior ssh interactive vs commands

These work, ssh remote 'echo hi > hi.txt' echo hi | ssh remote 'cat > hi.txt' but this does not work ssh remote sh -c 'echo hi > hi.txt' I expected to produce a file on remote named hi....