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

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When using an SSH alias, why is SSH ignoring my (valid) Kerberos ticket?

I am successfully connecting to my university's network via ssh with Kerberos ticket authentication. Normal, verbose operation (kinit a ticket, then ssh user@hostname) works fine. When setting up ...
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1answer
14 views

Does the default per user .ssh/config file override all options in system wide ssh_config? [duplicate]

The ssh man page says that the -F switch: Specifies an alternative per-user configuration file. If a configuration file is given on the command line, the system-wide configuration file ...
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1answer
37 views

ssh-agent: How to keep the login key, and add more identities?

When I log in to my local Ubuntu 14 instance from Windows (I use SecureCRT as a SSH client) using my RSA key, the key is available for forwarding for further SSH sessions (it is listed with ssh-add ...
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3answers
20 views

Unison - login over ssh with different username at remote server

I am trying to set up Unison and am testing the connection. I run this command from the documentation: unison /var/www ssh://192.168.1.102//var/www but it tries to log into the remote server using ...
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1answer
1k views

How do I prevent ssh remote login from breaking dbus?

I'm running openSUSE 11.3 on my workstation at work under KDE, I don't have root access to it. The default shell has been set to tcsh. When I am logged in at my workstation and log in remotely from my ...
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1answer
22 views

Stealing and reattaching a running process [duplicate]

It's sunday and I left an instance of R running in the office. The script finished running, and I would like to save my workspace without going to the office. I can ssh to the computer, but I have not ...
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1answer
107 views

Being Prompted for Password After Already Registered Public Key On server

NOTE: This is not a duplicate to the popular question. Why am I still getting a password prompt with ssh with public key authentication? I had an original post but I did not get much answers helping ...
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2answers
49 views

“SSH Virtual Kiosk”. Does “PermitEmptyPasswords yes” work? - How to make ssh user with empty password, so random users can use it?

How to make properly secure ssh account with empty password for running trusted binary? I'd like to make a kind of "virtual ssh Kiosk" for random users, while limiting "demo app" behind ssh ...
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1answer
27 views

Script for connection with ssh then command once connected

I need to write a script that connects to a remote server, then once connected, connects from there to another server, then changes directory. The following of course does not work (it connects to ...
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2answers
12 views

Host key verification failed (exit code 255) while using pdcp

I am trying to install a particular software across all our machines one by one so I decided to use pdsh. By default, it will operate on several machines at once in parallel, but I will be using the ...
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2answers
13k views

can't ssh into remote host with root, password incorrect

I have a remote host, previously I can ssh into it with root and password ssh root@remote_host or I ssh into it first using a regular user account ssh esolve@remote_host and then su root and ...
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3answers
313 views

the difference between '..' and “..” when I use ssh usr@ip 'pscp …'

My Server machine run Window,and it installed Cygwin. My Client machine run linux. In Clinent machine.I do this: [sikaiwei@login-1-2 v1.4]$ bash test.sh CHUN~19900405 ...
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1answer
27 views

Impact of removing ssh_config file

Pretty new to Linux here. Trying to get a better grip on the OS.  Here is my problem - I have a question about the impact of removing ssh_config file from a Linux box. I was having some cipher ...
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3answers
32 views

How to understand ssh-keygen and ssh-copy-id?

As far as my understanding, machine(A) ssh-keygen generates a key, and ssh-copy-id gives this key to another machine (B), is it? But when this is done, to test whether this is done or not is using ...
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1answer
59 views

Correctly closing multiple hop SSH tunnel

I want to tunnel VNC traffic to host2, which is only accessible from host1, whereas host1 is publicly accessible. I setup a multi-hop SSH tunnel as described in this question, using: ssh -L ...
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2answers
29 views

How can I auto-close dropped SSH connections?

When I work on my server remotely, sometimes my SSH connections get dropped due to network issues. When I re-connect to my server, the dropped sessions remain open. I can see them when I run w. I'm ...
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6answers
17k views

ssh returns message “X11 forwarding request failed on channel 1”

When I ssh into a remote server that's not running any type of X11 desktop environment I get the following message. $ ssh user@server X11 forwarding request failed $ ssh user@server ls X11 ...
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1answer
1k views

Why SSH login works in shell but fails in all third parties via ssh tunnel?

I'm using ssh to log in (prompt password first time) on a remote server. In shell, using this command: ssh root@myserver.com works well! But all other db software applications that I tested ...
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1answer
758 views

SSH to Linux Container from Other Machine

I am trying to learn about Linux Containers and this is my first encounter with servers, ssh and many other things that I do not know the terms yet. I create five different containers and authorized ...
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0answers
25 views

Can't ssh into my server from another computer

I used to be able to ssh into my server from other computers. But I stupidly messed up my remote connection setup a couple weeks back (I don't remember what I did...) and now I can't ssh into my ...
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1answer
25 views

cannot get screen command to execute code containing DISPLAY=:0

I am trying to ssh into a remote machine and run a shell script, which opens a GUI. I want the GUI to open on the remote machine and remain open (so I am using DISPLAY=:0 nohup). I tried: ssh -t ...
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0answers
12 views

Need to fix user access on centos

I screwed up user permission for my account "yann" on a centos 7 server. I would like to have that user to access rw on all folder under /home to manage the webserver folders. Each top level folder ...
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2answers
547 views

Can emacs use gpg-agent in a terminal at all?

I understand that there are problems with getting pinentry-curses to work with emacs (see some of the comments on http://emacswiki.org/emacs/EasyPG), and so using emacs in a terminal isn't compatible ...
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1answer
3k views

Nohup process not running into ssh

I have a question on the use of nohup in an ssh session. During more than three years my java software executed the following command daily using a remote ssh session: cd some_path; chmod 777 ...
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2answers
3k views

PHP exec command has the result 0 even if an error occurs

I have this PHP code: $execout=exec('ssh root@xxx.xxx.xxx.xx "sudo /etc/init.d/smokeping reload"',$output1,$result); if($result !=0){ echo"that can't reload"; } else{ echo "successfully ...
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1answer
49 views

ssh key_load_public: invalid format warning

SSHing into my system succeeds but even without the -v flag I get key_load_public: invalid format message. Below is the output w/ using the verbose flag. Specifically debug1: key_load_public: No ...
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2answers
43 views

linux_startscript.sh: 14: linux_startscript.sh: Syntax error: “(” unexpected

I'm trying to start a multiplayer server on my server. I´ve transferred the files to the server and tried to execute them with these commands: cd /home/user/RisingWorld/ sh linux_startscript.sh but ...
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0answers
53 views

Problem with ssh connection [closed]

I need to connect to my computer via ssh. I have to use VPN, because the remote machine is my computer at my workplace. I have no problems with using VPN. So, I installed open ssh server from the ...
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1answer
618 views

How do I push a Mercurial repository to BitBucket over ssh? [closed]

I created a public key for ssh and registered that key with BitBucket. I then attempted to push: $ hg push ssh://jhayward@bitbucket.org/johncharrell/[project name] pushing to ...
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3answers
30 views

nothing happens when I try to ssh [closed]

When I try to ssh into my work server, the command just gets stuck. The command doesn't return anything. When I strace'd it, it seems like its stuck mid-execution. I know it is a problem with my ...
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2answers
24k views

Meaning of “Connection closed by xxx [preauth]” in sshd logs

We have a Windows batch script, which connects automatically to a linux server via PLINK (putty). There is NO public private key authentication, the user and the password are in the script. On our ...
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Can't start remote WildFly with ssh

When executing remote script with SSH: ssh user@192.168.0.10 -t sudo /etc/init.d/wildfly start WildFly not started. If I run ssh user@192.168.0.10 -t /home/user/my.sh my.sh: !#/bin/bash sudo ...
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3answers
1k views

Does /var/log/secure log successes?

Short one that I've been unable to find a decent answer for. Centos 5.10 server, trying to trawl through all the logs I can to see what IPs successfully accessed the server. I've been mucking about ...
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2answers
79 views

Is there a one liner which can list public key fingerprints with authorized_keys as input?

I'd like to audit the authorized_keys file on a number of servers and match them with known AWS key fingerprints. Is there a one-liner which incorporates ssh-keygen -lf which will output the ...
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1answer
36 views

How to track ssh connection time, disconnection time and idle time?

How can I track ssh sessions on my server including ssh connection time, disconnection time and idle time? Here's what I have for connections: cat /var/log/{auth.log,auth.log.1} | grep -i Accepted | ...
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4answers
10k views

What is pageant for Linux? Saving SSH private key passwords

I want the computer like pageant, to show a SSH password prompt during boot time. I have my private keys stored in a Dropbox between 3 computers of which 1 is now Ubuntu. I have googled for 2 hours ...
3
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2answers
36 views

Feedback when entering passwords, without revealing length

I often SSH into a machine and use sudo on it. When entering passwords, I'm always afraid that another window will steal the focus. However, I don't want to display asterisks (with pwfeedback, for ...
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6answers
3k views

Linux equivalent to PowerShell's “one-to-many” remoting

Coming from Windows administration, I want to dig deeper in Linux (Debian). One of my burning questions I could not answer searching the web (didn't find it) is: how can I achieve the so called ...
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2answers
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Why does SCP fail when “RequestTTY force” option is enabled?

In my SSH config file, I have to enable the RequestTTY force for some important reasons. And currently my config file looks like this: Host x.x.x.x HostName yyyy StrictHostKeyChecking no ...
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1answer
49 views

Everytime I restart my Digital Ocean server, .ssh/authorized_keys changes

So I am facing a strange issue with my digital ocean server. Everytime I restart the server manually from the website my .authorizedkeys get reset. It always has a value ssh-rsa ...
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3answers
30k views

How to dd a remote disk using SSH on local machine and save to a local disk

How can I create a backup of a remote disk using SSH on my local machine and save it to a local disk? I've tried the following: ssh hostname@my.ip.address "sudo dd if=/dev/sdX " | \ dd ...
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0answers
53 views

Executing remote code with arguments

Why this: ssh -i ~/.ssh/master.pem ec2-user@xx.xx.xx.xx 'bash -s' < `dirname $0`/elements/"$element" returns hostname.sh test-5000: No such file or directory when $element is not a just a single ...
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4answers
61 views

Issue with ssh && apt-get, need advice

I decided to dust off my Beaglebone Black Rev.C and figured before I do much of anything, I should get everything up to date. I created an SD card with the new Debian 8.3 image and installed it. No ...
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1answer
2k views

Fail2ban with firewalld

I'm trying to configure fail2ban to block ssh from a local hosts. Fail2ban is install on CentOS 7 with firewall (Linux 3.10.0-229.4.2.el7.x86_64 x86_64 ). I have copied the jail.conf to jail.local i ...
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1answer
29 views

autossh over many LocalForward ports

I have to connect to a base server, call it server1, and the from there, I can access many other servers (host1, host2, ...host99.) I have the autossh working for server1 with no problems - it ...
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1answer
29 views

Ways to restrict remote user to only access a remote database

I want to be able to setup a remote user that can update a PostgreSQL database on a production server. I have two machines, one is a local server that I use as a command and control system, named ...
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2answers
3k views

Playing a remote movie on the remote computer

I have two computers (a desktop and a laptop) running linux connected to my local area network. I like to ssh from my laptop over to my desktop and run programs there, and sometimes listen to music on ...
2
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1answer
855 views

sudo -u git clone

I'm on Ubuntu server 14.04. I am using apache web server which runs as the www-data. I need to do git clone from a script (a web hook). This script will run with www-data user privilages. Running ...
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2answers
3k views

Force ssh to always use SSH_ASKPASS

I want to force ssh to always use the program specified by SSH_ASKPASS. In my case the program is just a bash script returning the passphrase. The problem is, as the ssh documentation says: If ...
3
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2answers
42 views

How to make ssh account capabele to only sshfs and rsync?

I'd like to make ssh account that is capable of doing two things: mounting (can be one) directory via sshfs performing backup&recovery of his/her desired directories using rsync I would love ...