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

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SSH hostname and IP address [on hold]

Please can some one help me with Linux root server IP or hostname with user name and password which port is 22 ssh to use for PuTTY? I need to use it for PuTTY, I've tried all username and passwords I ...
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SSH Tunnel with autossh

I can't seem to find a close enough example but here it goes. I'm trying to in the end setup rsync from one server to another through an ssh tunnel. Local (my machine) will run the rsync to pull ...
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1answer
42 views

How does a cisco device know if I'm connecting via telnet or ssh?

I'm experiencing strange behavior with a Cisco UC520 router. When I am directly connected to the router and telnet to it using this: telnet 192.168.1.1 23 Then I get a successful login prompt: ...
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While trying to ssh, pam_ldap always sends the password “INCORRECT” causing bind to fail

I installed ldap-auth-client nscd ldap-utils on lubuntu 14.04 running on a banana pi. I can successfully bind as the user using ldapwhoami, but I cannot log in via ssh: Auth.log: Oct 21 02:12:05 ...
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1answer
20 views

What permissions should each file under .ssh have?

What permissions should each file under .ssh have? I just experienced some glitch caused by .ssh/config not having 600. What permissions other files there should have?
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9 views

cssh intercepts F10

I am using cssh (cluster-ssh) to ssh to multiple machines simultaneously. Everything works great, except that cssh intercepts F10 key (which in cssh opens menu. This is very unfortunate, because I ...
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2answers
130 views

annoying message “X11 connection rejected because of wrong authentication” while there is no problem at all

I'm having an annoying problem. When I'm logged in to a specific host via SSH, the message X11 connection rejected because of wrong authentication. occurs three times seemingly random about once ...
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2answers
28 views

SSH into multiple remote machines through ssh tunnel [duplicate]

I am new to ssh-tunneling. Basically I want to be able to get ssh access to servers in a remote lab (say subnet 1.2.3.X). I can log into a machine that is visible say 11.22.33.44 I want to be able ...
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8answers
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How can I disown a running process and associate it to a new screen shell?

I have a running program on a SSH shell. I want to pause it and be able to unpause its execution when I come back. One way I thought of doing that was to transfer its ownership to a screen shell, ...
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12 views

SSH fork kills connection

I am using a linux script which has the task of forwarding control of the system to remote support. In this script one of the commands is a ssh port forward command that will forward the port of the ...
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Is it safe to disable password for a user, if it only uses SSH key login?

We want to remove the password usage on a UNIX system. The users should only log in with SSH key. Not password. So their password field in the /etc/shadow file will be "*" and set their password to ...
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1answer
70 views

Running commands after ampersand symbol & in a remote ssh session

I have a shell script that initiates a long, resource-intensive command on several different machines. In order to execute the script on each machine in parallel, I have an ampersand symbol after ...
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1answer
279 views

preventing the screen from being cleared when exiting an ssh session

I have rdist set up to push out some of my dot files to all the remote machines that I need to ssh into. I also have zsh as my default shell on all of those machines. When I ssh into a machine and ...
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1answer
615 views

Cant ssh, connection terminates immediately with exit status 254

The most recent thing I remember is changing the soft and hard memlock ulimit to unlimited. Now I cant ssh into the machine. This is the ssh log. Authenticated to IP ([IP]:22). debug1: channel 0: ...
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1answer
321 views

problem with unique ssh public/private key pair on second user [on hold]

I have created an ssh key pair using ssh-keygen -t rsa for my main user and everything seems to be working well. Password login has been disabled. I have a second user that I am trying to create a ...
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1answer
21 views

libvirt-bin error on a VM when I try to list VM

I'm using Virtualbox 4.3.18 on my Arch Linux Host machine and libvirt-bin 1.2.9 on my Ubuntu Server Cloud guest machine. Everytime I try to follow this tutorial I receive the following error when I ...
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1answer
32 views

Execute commands when specific user and ip login to ssh

How can I execute a few commands when a specific user with a specific IP logs on via ssh?
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1answer
736 views

SSH agent forwarding, multiple hop

I tested this setup with Linux origin machine - everything is the same - only the first hop can use keys from origin machine. Initial problem I'm trying to set up SSH agent forwarding with multiple ...
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2answers
145 views

Ctrl-S doesn't work in rtorrent when accessed via screen. Can't start torrents

I run rtorrent remotely on a seedbox. When I log in with a web interface I'm able to start torrents, and when torrent files get dropped into my watched folder that works too. However, when I try to ...
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1answer
14 views

Send commands to screen within screen

login to Server1 and run screen SSH to Server2 and connect to an existing screen session Realise ^A commands are procesed by Server1's screen only Is it possible to control Server2's screen in this ...
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1answer
59 views

Chroot gone wrong, can't ssh with user

Distribution: Scientific Linux 6.5 (Carbon), not exactly your typical brand of linux. Tried to chroot a user using these instructions for SSH and quite obviously failed, and now I can't even log in ...
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2answers
792 views

Ctrl-C handling in SSH session

When I start an SSH session that executes a long-running command, what happens with Ctrl+C (SIGINT) handling? I can see that the SSH session is closed, but I am not sure who gets the SIGINT first: is ...
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718 views

How can I forward a already forwarded ssh key into tmux?

I'm connecting through SSH from a machine where my keys are stored, forwarding to a second machine, and then try to use the keys from within tmux. I appear to "loose" the forwarding when entering ...
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3answers
431 views

Different “history” command output after reconnecting via SSH

Why do I get different results for the "history" command for the same user after I reconnect a disconnected SSH session? I connect to a server using putty (SSH), say as root My network gets ...
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1answer
4k views

How do I disable SSLv3 in an OpenSSH SSH server to avoid POODLE?

In wake of the newly-discovered POODLE vulnerability, I'd like to disable SSLv3 on all of my SSH servers. How do I achieve this with OpenSSH?
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5k views

sshfs mount, sudo gets permission denied

I am using sshfs to mount a folder with some python projects over ssh to my ~/ directory. $ mkdir -p ~/mount/myprojects $ sshfs user@myserver:/home/user/myprojects ~/mount/myprojects I can perform ...
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1answer
24 views

Where should my authorized_keys file be if I want to ssh to `localhost`?

I have my public / private key setup, but I don't know where it should go. Should both these files be placed in ~/.ssh/ for my user?
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1answer
38 views

SSH Pub Key Login without Password

I am configuring an SSH Server on Ubuntu 14.04.1 Server Edition. The goal is to use public key authentication only and only permit certain usernames. My public and private keys are created and a ...
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3answers
391 views

Port 22 connection refused

I’m trying to copy a disk image over ssh to my local machine using this tutorial on linodes website. I know this could be posted on their support forum, but im convinced its in the general realm of ...
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3answers
345 views

Install pdflatex via SSH on Amazon EC2 instance

I need to install pdflatex on my Linux powered machine (Amazon EC2 instance, didn't decided yet which distribution would be the best so also feel free to give a hint) because I want to connect ...
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1answer
362 views

Dynamic port forwarding using socat

I'm trying to replicate the functionality of ssh -D <PORT> user@machineX to tunnel all my traffic from my current machine via machineX. I do not need the ssh shell open at all, I simply wish to ...
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3answers
1k views

How to prevent shutdown when an SSH user is logged in?

I'm administrating a networked environment and I had an interesting situation arise yesterday. When a host is required to shutdown by a regular user, it refuses to do so if other users are logged in ...
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1answer
23 views

Reverse ssh tunnel in config

How can I establish a reverse ssh tunnel with my ./ssh/config file? I'm trying to reproduce this command ssh -R 55555:localhost:22 user@host in my .ssh/config file so that when I type ssh host ...
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1answer
27 views

SSH over multiple server and save output of multiple commands in file on local server

I want to SSH over multiple server (host 1, host2 and host 3) and save output of multiple commands (cmd1, cmd2 etc) in file (output.properties) on local server. I know there are a few posts similar to ...
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1answer
645 views

SCP Lost Connection

I can successfully connect to my server via ssh but when trying to run the scp command I get a connection time out. $ scp ~/.ssh/id_rsa.pub root@192.168.12.2:id_rsa.pub ssh: connect to host ...
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error: Bad prime description in line [closed]

Aug 17 09:34:17 vps-aadsshd[130428]: error: Bad prime description in line 186 Aug 17 09:34:17 vps-aadsshd[130428]: error: Bad prime description in line 187 Aug 17 09:34:17 vps-aadsshd[130428]: error: ...
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How can I get console ssh to NOT ask for my private key password every time? [duplicate]

I have a program required by work installed on a Debian Wheezy box. Previously I was using Mac OS X (switch details irrelevant). I have an SSH keypair at ~/.ssh/id_rsa{.pub}. That keypair has a ...
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1answer
3k views

CentOS Local User not able to view directories/files via FTP login

Currently running CentOS 6.5 with vsftpd. As a newbie, I would like to explain my process and then have the proper process explained back to me from scratch which I believe will solve my issue. I am ...
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3answers
750 views

Read first line of a command's output. Command connects me to a remote terminal

Part 1 Say I have a command my_command that outputs multiple lines. I would like to capture the first line of my_command's output as soon as it's ready in a script, while keeping my_command ...
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2answers
5k views

How does SSH connection survive a network restart?

From a Linux SSH shell, type /etc/init.d/network restart to restart the network service. I expect my SSH connection to die since the network service goes down. But it doesn't. Very cool. But how does ...
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1answer
52 views

Need to automate file transfer from linux server to windows shared folder

We need to transfer files from a Linux server to a Windows shared folder. we don't have any Samba server. Can you please explain a better way?
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92 views

What elements affects the key pairs generated by ssh-keygen?

I use the ssh-keygen -t rsa to generate the RSA key pairs. I see that in the id_rsa.pub file, I see the username and the hostname. But I want to know that what elements will affects the key pairs. ...
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2answers
59 views

How to do a grep on remote machine and print out the line which contains those words?

I have few logs files in my machineB under this directory /opt/ptd/Logs/ as shown below - My logs files are pretty big. david@machineB:/opt/ptd/Logs$ ls -lt -rw-r--r-- 1 david david 49651720 Oct 11 ...
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2answers
1k views

GNU screen freezes trying to reattach

I have several long-running GNU screen sessions. I ssh to the box they're running on and run screen -d -r foo to detach them if they're connected anywhere else, and then attach them in my current ...
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2answers
37 views

How to connect to a VPS without SSH.

I have a fresh VPS I just bought, for playing only. No risk of any kind involved, so I noticed that due to my slow connection I have to wait seconds to finish writing commands and opening/closing ...
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1answer
28 views

Terminating SSH called from a script (SIGPIPE handling?)

so I was wondering why there are some hanging SSH connection left from some of my automated scripts and I came to a weird issue - SSH, if used without PTY, doesn't terminate when the output pipe gets ...
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1answer
755 views

How to execute Netscaler commands through a remote machine via SSH connection

I have been trying to execute some NetScaler commands like "bind" & "unbind" through a Linux Box via an SSH Connection. Now the Problem is, Manually we are able to enter & execute commands on ...
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26 views

SSH connection speed drops after some time of inactivity

I use MC to transfer working files from my Ubuntu 14.04 to other Linux hosts (mostly CentOS5). Shell link is opened by F9->R->H(shell link)->${host}->Enter combination (in MC). Then I can copy files ...
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1answer
427 views

tmux with iterm2 attach a remote session

I'm using the Tmux integrating with ITerm2, which can create a tab in ITerm 2 for each window created by Tmux. But somehow this doesn't make much sense for the usual SSH scenario, where we first SSH ...
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3answers
1k views

How to open a port early in boot process to unlock LUKS via SSH

I have a fully encrypted server running Debian 7 and have set up dropbear and busybox to unlock the LUKS container via SSH (as described in this tutorial and in this U&L answer). Unfortunately, ...