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

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11
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3answers
10k views

SCP from one server to another without password prompt

What is the best way of doing SCP from one box to the other without prompting for password? There are two servers: Server A (10.152.2.10): /home/oracle/export/files.txt Server B (10.152.2.11): ...
11
votes
5answers
2k views

How to copy a file that is still being written over ssh?

Here is the situation: I am uploading a large file from client A to a server using sftp. I also need to download this file from the server to client B over ssh. What I would like to do is start ...
9
votes
2answers
8k views

Starting firefox on a remote host (over ssh) opens a new window locally: what is happening?

I have never noticed this behaviour before, and am a little confused as to what is happening. I have a local copy of firefox running, then ssh (ssh -X <url>) into a remote server and start a ...
7
votes
1answer
2k views

How to use ssh-agent with multiple (valid) keys and yet choose which one to use?

Let's say there are two keys A and B, both of which are valid for user@host public key authentication. Since authorized_keys is configured for different behaviour depending on the key, ~/.ssh/config ...
5
votes
5answers
6k views

How to securely allow scp, but not ssh

I work from a Mac Book Pro (called foo). I have a server where my customers scp large files to. (called bar). I frequently ssh into bar, and scp a file (called buzz) to my Mac. bob@foo$ ssh bar ...
5
votes
2answers
1k views

Can't share an ssh connection with rsync

In my .ssh/config file I have the following: Host xxx User yyy HostName zzzz ControlMaster auto ControlPath ~/.ssh/%r@%h:%p This works great for multiplexing my ssh connections (i.e. login once, ...
4
votes
2answers
173 views

SSH - How to make X applications run on client?

I have the reverse problem that most people seem to be having. If I start an X application while logged into ssh, it displays on the server(host) machine instead of the client(local). This is the ...
4
votes
3answers
802 views

DynDNS alternative for SSH?

I have an server that has a dynamic IP address and is accessible over SSH. On the server, a script uploads a text file containing the server's public IP address to a web location whenever that address ...
3
votes
2answers
781 views

Fastest ssh X tunneling on a local secure network

I have read in a few websites e.g. (1) that the default ssh cipher is not necessarily the fastest. I work on a local fully secure network. Assuming that security is not an issue and that I just care ...
3
votes
1answer
2k views

Start network service at boot time on CentOS

I've recently reinstalled CentOS onto a computer of mine. I have OpenSSH Server on it now, as did I before I reinstalled the operating system. Here's the difference: Before, SSH started without even ...
0
votes
3answers
10k views

Method to check connectivity to other server

I want to check connectivity between 2 servers (i.e. if ssh will succeed). The main idea is to check the shortest way between server-a and server-b using a list of middle servers (for example if I'm ...
9
votes
1answer
1k views

Why does SSH not consult /etc/hosts?

I'm administrating a networked environment where the users authenticate over NIS. All machines can be used to SSH into the server but one. On the machine in question, I get the message ssh: connect ...
8
votes
3answers
5k views

Permit root to login via ssh only with key-based authentication

I have some doubts about certain ssh server configurations on /etc/ssh/sshd_config. I want the next behavior: Public key authentication is the only way to authenticate as root (no password ...
8
votes
2answers
2k views

How do I background an SSH session? [duplicate]

Possible Duplicate: How can I break away from an SSH session that has crashed? I have started an SSH session on the command line, but now I want to get back to my local command line. For ...
7
votes
4answers
492 views

Stopping output from a program run in SSH session NOW

Problem I execute command that outputs LOTS of information through SSH. For example, I foolishly add debug information inside a loop that executes million times, or just run cat /dev/urandom for ...
6
votes
1answer
6k views

X11 forwarding an OpenGL application from a machine running an NVIDIA card to a machine with an AMD card

I'm interested in forwarding an X11 session over SSH, in order to launch a remote process that utilizes OpenGL (specifically, gazebo for anyone familiar.) The problem that I seem to be running into ...
6
votes
2answers
2k views

Giving some users only SSH and shell access with limited resource usage

I'm trying to make a user that can access my server through SSH and allow it to have a shell, limited to using only, say screen and irssi. And it shouldn't it be able to see other directories except ...
6
votes
2answers
724 views

Configuring a vncserver so it's only accessible from my ssh tunnel

Since I use vnc through an ssh tunnel, is there any way I can block the open vnc port that the remote machine is listening on without it affecting my ability to use the ssh tunnel? Both machines are ...
6
votes
2answers
6k views

Not able to ssh in to remote machine using shell script in Crontab

Below is the script which i am trying to run, which runs without any issue for i in `seq 200 2100` do usr=(`ssh -t -t -o ConnectTimeout=60 machine$1 finger | tail -1 | awk '{print$1}'`) echo ...
5
votes
1answer
5k views

Cannot start xterm over ssh after several successes

I am running some MATLAB scripts on the command-line of a remote computer using ssh. These scripts launch 5 xterms that are forwarded to me via ssh (using the -X option). At the moment I am debugging ...
5
votes
1answer
1k views

Mosh: Retain backscroll beyond terminal window height

I'm experimenting using Mosh instead of raw SSH for remote shell connections. So far I like it, but I've become used to being able to page-up or scroll through backscroll in my terminal window to see ...
4
votes
2answers
1k views

Restrict password-less backup with SFTP

I need to perform backup of a server to my computer using Duplicity: duplicity /etc sftp://backup@my.dynamic.ip.address//home/backup Before this can be done, I need to allow password-less access by ...
4
votes
1answer
395 views

Executing a remote command on SSH connection, before login

I am trying to find a way to execute a specific command when connecting to a server via SSH. By this I mean, the command will execute unconditionally on opening a connection, so this would preferably ...
4
votes
4answers
4k views

What slows down my ssh login?

Everytime I ssh login to a server, it is always very slow. As a reply to my earlier post said, "grepping through a 200 line file should take millisecond or so, so I would doubt its that." I tried ssh ...
4
votes
2answers
403 views

Sharing private keys across machines

Say I have local access to two machines A and B and remote access to machine C. If I generate a public-private pair of keys for accessing machine C from A, can I share the private key with machine B ...
4
votes
5answers
429 views

What should I do with a remote AIX machine if I accidentally “chmod 644”-ed the “/usr/bin/ksh”?

Now the machine asks for password...The ssh was configured with key auth.. The problem is that ksh doesn't has executable permission anymore.. :\ What can I do remotely? Any tips? The root's shell ...
4
votes
1answer
2k views

Forwarding X11 over SSH if the server configuration doesn't allow it

Consider a situation where I'm logging in over SSH from machine A to machine B, I have an X session on machine A, and I want to run an X program on B. ssh -X B makes this work transparently. But what ...
3
votes
1answer
865 views

SSH Login doesn't work using a key Without Password?

Agent admitted failure to sign using the key I'm working on centos6.5(32bit) and I have tried to ssh log in without Password Using ssh-keygen & ssh-copy-id? the steps that I have done: first I ...
3
votes
2answers
13k views

Convert Amazon .pem key to Putty .ppk key Linux

I have generated and downloaded a private .pem key from AWS. However, to use Putty in order to connect to the virtual machine, I must have that key in .ppk format. The process of conversion is ...
3
votes
1answer
479 views

Disable ForwardX11Timeout without ForwardX11Trusted in OpenSSH Client?

By default, recent versions of OpenSSH automatically set ForwardX11Timeout to 20 minutes if you set ForwardX11Trusted to no. This means that 20 minutes after you start your ssh connection, you can't ...
3
votes
2answers
374 views

Simulate x-screen?

I'm working in a koding terminal running ubuntu 13.04, and I'm trying to run an application that requires an x-screen (even to run in terminal mode). I am unable to connect with x11 forwarding, and ...
3
votes
1answer
2k views

LAN server with two network cards, can't telnet / ping to the second even if it works

I have an issue with an Ubuntu 12.04 LTS (updated) server. For reasons too long to detail, it has got one eth0 interface assigned to 192.168.1.9 and one Wifi wlan0 interface assigned to 192.168.1.10. ...
3
votes
1answer
320 views

Clipboard over SSH session through VIM

I have a server running SSH, when I edit a file with vim on the remote server, :y+ doesn't work since the VIM binary on that linux system wasn't compiled with X support. (E488: Trailing characters) ...
3
votes
2answers
2k views

SSH tunnel to router periodically hangs. TCP problem?

Something weird I've noticed since upgrading my office router to the Buffalo WZR-HP-G300NH. When I remote in using an SSH tunnel, the tunnel will "freeze" pretty often. The freeze lasts 1-2 minutes ...
3
votes
1answer
2k views

How can I convert a PEM key into a RSA key pair?

I was just sent a PEM key from a client as a means to access their Amazon EC2 instance. How do I convert this into something I could use with OpenSSH?
2
votes
1answer
141 views

how to connect ssh 'with' specified port?

I know how to connect 'to' a certain port when ssh'ing. ssh user@remotehostip -p XXX but is there a way to establish a ssh 'with' a certain port? I mean, is there a way to specify the port which ...
2
votes
1answer
578 views

How to password-less log on via ssh alias

Suppose I have access to pc via a server. I can directly log-on to pc by using How do I connect to a pc through another pc using ssh Such that my .ssh/config looks like: Host short Hostname pc User ...
2
votes
2answers
5k views

SSH + Sudo + Expect in Bash script: Run command with sudo in remote machine

I am trying to automate the deploy of some .deb packages with an script. I want to execute sudo dpkg -i $myDeb.deb in a list of remote machines I can access with ssh. I've tried to automate the ...
1
vote
0answers
65 views

User Acces restrict to only one folder

I am trying to establsih SFTP User rights at a server to only one folder, following the guidelines here: ...
1
vote
1answer
317 views

DROP all for port 22 if not geoip set of US for iptables and xtables

I want to simply block all ssh access from anywhere but with in the US. This is my whole iptables, and I have followed ...
1
vote
1answer
48 views

log into a machine through another, with (de)compression at the ends only [duplicate]

I have looked all around but couldn't find the answer to a very simply question: I would like to log into machine C from machine A, passing through machine B. However, B is slow, so I would also like ...
1
vote
1answer
479 views

How do I set Keyboard and profile preferences when connecting to Solaris via SSH?

I'm connecting to a Solaris box from Mac OS X. Whenever I have connected to linux boxes in the past it has been much easier to navigate around. How do I fix these configuration issues on Solaris? ...
9
votes
2answers
2k views

Ssh login hook?

Is there a way to run a script/command every time a user connects using ssh? Can it be configured globally (i.e run the script when any user login)? I came across this question on Identica, but there ...
7
votes
2answers
4k views

How can I set up SSH on Linux to log in password-less?

My Raspberry Pi is running the default Debian image and has SSH enabled. I log into my Pi as follows: ssh pi@<IP-address-of-my-Pi> I have to enter my password every time. Can I somehow make ...
7
votes
1answer
703 views

What steps does the system go through when handling an SSH connection?

What steps does the system go through when handling an SSH connection? We try to log in via ssh sshd starts pam and pam module to authenticate us Depending on pam configuration, we need to provide ...
6
votes
4answers
17k views

ssh Connection refused: how to troubleshoot?

I'm trying: $ ssh eric@myserver where myserver is a machine in the intranet. I can ping myserver or respond to HTTP on port 8080, etc, but when I try ssh, I get ssh: connect to host myserver port ...
5
votes
3answers
141 views

SSH to two addresses, use the one that connects first

I have a home computer (let’s call it franklin because that’s what I call it) that I often ssh into from my work laptop. When I’m at home, I ssh to franklin.local, and when I’m at work or anywhere ...
5
votes
5answers
797 views

How to setup password-less ssh with RSA keys

I am trying to setup a password-less SSH configuration between two machines and am having trouble. There are a ton of howtos out there that I have followed and have had no success. Here are ...
5
votes
2answers
21k views

Why do I get an “rsync: failed to set times on … : Operation not permitted (1)” error on Ubuntu 10.10 with SME Server 7.4? [duplicate]

I am trying to cron an rsync via ssh between two fileservers that are running SME Server 7.4 and Ubuntu 10.10, respectively. The first rsync worked just fine (for reasons that I do not know), but now, ...
4
votes
5answers
564 views

Securely tunnel port through intermediate host

I'm looking to route a port for VNC back to my house here. I have to jump over a single host to then hop to my actual work machine. sittinghere will be my local home machine hopper will by the ...