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

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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
682 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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3answers
2k 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
2k 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 I'...
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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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3answers
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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 running....
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2answers
8k 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
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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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2answers
148 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
193 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
170 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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111 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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3answers
2k 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, ...
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5answers
586 views

SSH login and /tmp on 100%

Not counting the reserved space by root (usually 5%), if the /tmp is really 100% full, so 0 bytes free, why couldn't we log in to the machine via ssh? We only got the error message "cannot fork". ...
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1answer
7k views

Expired password and SSH key based login with UsePAM yes

There is a SLES 11 machine. The users logs in via SSH and pubkey (mixed, some user uses password, some use ssh key) The sshd_config has: UsePAM yes PasswordAuthentication yes PubkeyAuthentication ...
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3answers
630 views

Securely passing user input to command

I have a daemon daemon running in Server A. There, there's an argument based script to control the daemon daemon_adm.py (Server A). Through this script I can insert "messages" to daemon coming from ...
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1answer
833 views

Work around two-factor SSH auth with Master connection and port forwarding?

The problem 1.0 I'm working on a server that only supports two-factor auth (keypair auth is disabled). So every time my SFTP client wants to upload a file, it asks me for a token... after 3 minutes ...
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2answers
257 views

Copying Files Through Two Layers of SSH from Windows

The place I work has a login server, and then I login to a Linux box from that login server. As in, ssh login@host ssh computer_name providing authentication each time. If I'm working from my ...
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1answer
565 views

DSA/RSA keys work with Linux but not HP-UX

I have an NFS mount that I use to log into many Linux/Unix servers. I created a passphraseless RSA and DSA key from with I copied the id_rsa.pub and id_dsa.pub files over to authorized_keys. total 9 ...
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1answer
349 views

How does Linux generate ssh keys after reboot?

I installed CentOS 7, and noticed that I have rsa and ecdsa keys generated. I deleted all of them and rebooted the machine. I got a new pair of rsa and ecdsa keys. How does Linux generate the keys? ...
2
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1answer
383 views

Using rsync to copy from local to remote server with cronjob, asking for password

I want to copy files from a local machine to a remote machine. I have the command all set up and it looks like this: rsync -a project root@123.456.789.0:~ However, when running this command, I'm ...
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1answer
320 views

Cleanup trap for ssh command on multiple remote hosts

I want to execute an arbitrary command on multiple remote hosts using ssh. These commands are mostly long running commands that monitor server resources and aggregate the output to my local ...
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1answer
533 views

Open file over ssh in local X window [duplicate]

How can I open html file in local internet browser? I am connected under /ssh://user@server.... I'm thinking about something like firefox file_from_remote_server.
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1answer
104 views

ssh and screen automatically - what am I missing?

This works fine, but does not load my ~/.bash_profile on server2. Why? $ ssh -A -t server1 ssh -A -t server2 bash -c "screen -dR"
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5answers
2k views

ssh command unexpectedly continues on other system after ssh terminates

I'm running the below command, and monitoring the output file on the other system: ssh $ip_address 'for n in 1 2 3 4 5; do sleep 10; echo $n >>/tmp/count; done' If I kill the ssh command ...
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1answer
389 views

Creating an SSH tunnel from a linux VPS to a web server database

I'm creating a server application that clients will connect to. The server application is running on an Ubuntu Server 14.04.1 VPS. The server needs to be able to connect to a MySQL database hosted on ...
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1answer
37 views

Repository for Family Pictures [closed]

I have a Debian computer and a MacBook Air. On Debian I created a repository: mkdir -p /repository/git/2014.git cd /repository/git/2014.git git init --bare --shared On the MacBook I then typed: cd ...
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2answers
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How to give password directly while doing ssh command?

I am using Putty to connect to host xxxxxx. I want to produce a shell script in which I should give the command ssh user@yyyyyy along with my password instead of giving it when prompted.
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1answer
4k views

My cloud server came with PermitRootLogin without-password, is it normal?

I was just wondering if it is normal that in the Ubuntu 14 provided by my cloud hosting company,there is this configuration in the file /etc/ssh/sshd_config : PermitRootLogin without-password ...
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2answers
4k views

Remote monitoring Linux server from Ubuntu workstation via SSH [closed]

I am looking for a convenient way to monitor my Ubuntu server from my laptop (running Ubuntu Desktop). I understand this is easily achievable by SSHing to the server and running commands, but I'd like ...
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0answers
414 views

SSH server doesn't respond for a while, then opens up briefly after port scanning

On my local machine I try to ssh into my server but it gives me connection refused. Doing an Nmap of my server tells me there are no open ports. pinging the machine works. What I've done so far is ...
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2answers
4k views

Disable ssh banner for specific users or ips

I've enabled the banner that appears before the password prompt by setting it it sshd_config. However certain users (especially me) really don't need to see the banner (it also screws up a lot of ...
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3answers
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how can shellshock be exploited over SSH?

Apparently, the shellshock Bash exploit CVE-2014-6271 can be exploited over the network via SSH. I can imagine how the exploit would work via Apache/CGI, but I cannot imagine how that would work over ...
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3answers
3k views

How to copy, execute and retrieve data from a remote computer?

I am trying to run some calculations on a remote computer. Basically I want to copy some files to the computer, load a software, execute the calculation, then retrieve the data back. I have created a ...
0
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1answer
181 views

automatically copy file from local server to remote server after login over ssh

I need to know how to copy a file from local server to remote server automatically after login using ssh. actually In my local server so many users are there with their local userid . but they will ...
2
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1answer
700 views

Setting up a user for sftp acces into a sub directory of another users home directory

An interesting problem. The broader goal is to setup a directory that one of our clients can sftp into (via ssh keys, not user/pass combination) and upload files. This directory will need to be ...
3
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1answer
717 views

Use sudo with ssh command and capturing stdout

I'm trying to run a command as root (via sudo) on a remote server, and capture stdout (but not stderr) into a file. eg. Something like this: ssh user@remote "cat /root/file.tar | gzip" > root-...
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2answers
7k views

Tunnel yum traffic through another server via ssh

I am running a Fedora desktop behind a corporate proxy that is blocking yum traffic (specifically *.gz and *.bz2). I have access to a separate RedHat machine via ssh which can download anything it ...
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1answer
208 views

SSH to a server, execute update command that continues even after logging off the ssh session

Okay I saw a lot of questions like this, but almost all have either theoretical answers which do clear the concept but I am still not able to put it up in code. What I want to achieve using a bash ...
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1answer
1k views

SSH Login Alert Using pam_exec

Hi I have been trying to follow the information about pam_exec from here: Ssh login hook? When a user log's in they get: /etc/pam.d/email-alert.sh failed: exit code 8 My sshd file has this at the ...
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4answers
11k views

Can I pipe /dev/video over ssh

I have two computers, a desktop in my office ( with a webcam attached ) and a laptop somewhere else on the network. Usually I take a look at my office through my webcam by running ssh Office -Y "...
3
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1answer
398 views

How can I lock down a user account to the point that it can read/write/execute as little as possible?

I would like to lock down an Arch Linux user account to the maximum extent possible. The only functionality required for the account is to accept a non-terminal SSH session which allows the client to ...
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0answers
86 views

RDP from Windows PC to Linux

I have my Windows on network A and Linux machines on network B. I want to access the 0th desktop of one of the Linux machine from my Windows. I can ping my Windows machine on network A from the Linux ...
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1answer
956 views

ssh settings `permitopen=“localhost:4000”` does not limit remote port forwarding [duplicate]

I have a special user on my server, let's call it foo. I use it only for port forwarding. The user's .ssh/authorized_keys2 is set up to prevent login and to open only a specific port: no-pty,no-X11-...
0
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1answer
82 views

Sync Pi with local directory

I have setup a Pi with ArchLinux. Now I want to sync one directory called Pi on my local machine with the directory Pi on my Pi. At first I have written a little script that uses rsync but I've run ...
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1answer
94 views

help organizing ssh aliases

My .ssh/config is starting to grow with aliases, and remembering them all is getting harder. Do you have any tips for better manage this growing collection? For example an autocomplete when I type ...
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1answer
200 views

Control-p freezes SSH session

I have encountered a strange situation on one of my SSH ARM machines I use on a daily basis. Every time I connect to the server and press Ctrl+P to invoke previous-history BASH function SSH connection ...
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1answer
513 views

Why is my winscp session not showing in Linux?

When someone open the sessions using Winscp its session is not showing in Linux when I run who or last commands. I thought that it will appear because it is using ssh to connect. But still there are ...
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1answer
522 views

URL Rewrite on debian not working

When trying to enable URL rewrite I just can't get it to work. I've enabled it with the command sudo a2enmod rewrite and I've restarted the service using sudo service apache2 restart. However in the ...
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2answers
313 views

Accessing Linux server via VPN or Certificate based ssh?

My company has a fairly common security setup where you need to log in via VPN, when outside the company network in order to get access to the servers. The biome is mostly Windows machines. I'm ...