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

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SSH only works if I specify the key with -i

I have a server that only allows ssh with a key. However when I try to ssh to this machine I get the error "Permission denied (publickey)". From the auth.log on my server this is happening pre auth. ...
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2answers
162 views

What are the strengths and weaknesses of the ssh-keygen algorithms and is one of them the most secure?

I was wondering about the different types of keys you can create with ssh-keygen -t (dsa | ecdsa | ed25519 | rsa | rsa1). Since different types are offered I assume that each has a specific advantage ...
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2answers
93 views

Using reverse SSH tunneling in one step instead of two steps (with -X)

Suppose we have three hosts: miki - my computer behind a NAT vps0 - my VPS mum - computer of my mother, behind a different NAT. The task is to connect from my computer to my mum and keep X11 ...
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3answers
1k views

How to limit the number of active logins per user?

How can I limit the number of active logins per user? I've seen this on various servers before, and I was wondering how I could set this up myself. Perhaps in those cases, this was accomplished by ...
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5answers
19k views

Download n Upload files via telnet session

I have an attendance Device with Linux OS installed. I am able to connect that device via telnet session. There are some files in the device which I need to download and upload with new files. How can ...
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5answers
285 views

Simulate the remote host identification warning

I need to simulate the warning: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING ...
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2answers
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Non-interactive shell expand alias

I'm having trouble getting aliases to expand on my hosting account when I run a command like: ssh user@server "bash -c \"alias\"" My .bashrc file is: echo .bashrc # .bashrc shopt -s ...
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3answers
5k 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 ...
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2answers
210 views

Why does the while cycle skips and only reads the first line?

$ ls testscript.sh testservers.txt $ cat testservers.txt serverA IMM 10.2.3.4 USERID PASSW0RD serverB IMM 10.2.3.5 USERID PASSW0RD $ $ $ cat testscript.sh #!/bin/bash # test them.. egrep ...
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2answers
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-bash: cd: .ssh/: Permission denied

When I type in cd .ssh in terminal, it returns with -bash: cd: .ssh/: Permission denied. Now I cannot add my ssh keys to ssh. When I type ssh-add ~/.ssh/idname it says /Users/Dan/.ssh/idname: ...
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3answers
172 views

force ssh to change dir after login based on config

Is there any way to force ssh to change it's working dir in ~/.ssh/config or by using other configuration files? I have a lot of servers with different environments. Each environment is installed in ...
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1answer
1k views

Does Public and Private key remain the same for a user or system?

I had requested access to a git repository and it was granted after I gave my public and private keys. ( generated using the common method ssh-keygen -t rsa which gave me : <user> @ ...
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1answer
239 views

Was my Unix server compromised?

Someone asked if this constituted a break-in and wondered if their server had been compromised. Jan 12 04:16:51 foo sshd[26725]: Failed password for root from 61.174.51.207 port 1076 ssh2 Jan 12 ...
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2answers
151 views

SCP files from machineB to machineA

I am trying to scp the files from machineB to machineA. I need to run the scp command from machineA to copy files from machineB to machineA. The file that I need to copy from machineB is - ...
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3answers
1k views

What happens if I delete all user passwords?

I have a Fedora VPS with a root user that has no password. I login with SSH keys. I had another, less privileged account on that server, used for web administration. I've now deleted its password ...
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3answers
793 views

What is difference known_hosts

I have no deep understanding of SSH and I am a bit baffled about the relation between the /home/XXX/.ssh/known_hosts and /etc/ssh/ssh_known_hosts files. Can someone explain this?
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3answers
2k views

How to automate connecting to multiple network devices, running a command and saving the output to a file?

I have to run a command on around 1000 network devices and save the output to a file. In a file I have a list of all the network device names that have to be connected to using SSH. I then have to run ...
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3answers
647 views

Is there a way to maintain ssh-agent connectivity in different screens?

Whenever I use ssh-agent for passwordless logins it doesn't work across different logins and screen sessions, even if they are concurrent. I suspect it uses some shell variables that don't work ...
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2answers
3k views

Connecting to host by SSH client in Linux by proxy

I am really struggling with this. My host (A) is behind a proxy/firewall (PF) and needs to connect to host H. The proxy has HTTP/FTP/SOCK proxy configured and I have no issue to configure in ...
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2answers
688 views

Why does my Emacs toolbar look different over ssh w/ X forwarding on Cygwin vs CentOS?

I'm using Emacs 24.2.1 installed on a CentOS 5 server, which I ssh into with X forwarding (using -Y). I have both a Windows laptop with Cygwin/X installed, as well as a desktop running CentOS 6. When ...
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1answer
2k views

SSH host key keeps changing

I am trying to set up a web service (using the Play Framework) on an Ubuntu machine on the network. However, I am experiencing intermittent failures connecting to it, not being able to connect to it ...
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2answers
915 views

Use desktop speakers over SSH from laptop

I have VLC media player and media files on a desktop CentOS 6.3 set up (without a GUI). I can play the media files at the machine but when I issue the command via SSH it is silent. I'm guessing it's ...
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1answer
1k views

SSH locking up: suspect local problem, not remote

On my work computer, I regularly SSH into two unrelated servers. Sometimes the SSH session locks up (does not respond to keyboard input). When locked up, I can SSH in via a second open terminal, that ...
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2answers
1k views

Bypass sshd AllowTCPFowarding=no by installing own forwarder?

In the man pages for sshd_config, for the AllowTCPForwarding option, it states: AllowTcpForwarding Specifies whether TCP forwarding is permitted. The default is “yes”. Note that disabling ...
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2answers
147 views

SSH encryption security

If I log in to my server through ssh and copy files to my local computer can I be eavesdropped? How do I make sure nobody can intercept the data or even know what I am copying? Are there levels of ...
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2answers
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Problem with SSH “ Write failed: Broken pipe ” [duplicate]

Possible Duplicate: What does the Broken pipe message mean in an SSH session? I run a program on server with SSH ! the program runs normaly and after a period of time i receve a message ...
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1answer
344 views

Script to let the user cancel a shell logout

I want to write a script to display a message and possibly cancel a logout from an interactive shell. This is because I often run background jobs in some of my shells and in the spur of the moment I ...
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3answers
424 views

Help me to replace sshfs with ssh?

I love to do just this: $ sshfs mountPoint myServer $ cp thisFile mountPoint I am now using LiveCD and I do not have sshfs utility available and I need run $ sudo dd /dev/sdb2 > mountPoint, how ...
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2answers
3k views

Remote SSH login not working

I have a PC behind a router with port forwarding setup Port 22 for SSH which works perfectly - I can login and everything. What I am trying to do is let this PC connect to a VPN and only allow ...
2
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1answer
200 views

Why logs show a different ssh connection port # than the one specified?

My Ubuntu runs ssh on port 22. But my /var/log/auth.log says different port numbers when connections are made. And the port numbers are seemingly random: Connection from xxx.xxx.xxx.xxx port 33692 ...
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5answers
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full access to remote computer without remote static IP

How can I access to remote computer that the remote computer is in a local network? I worked with reverse ssh : http://www.vdomck.org/2005/11/reversing-ssh-connection.html I don't want just SSH but I ...
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1answer
991 views

Deny external SSH access to a user

Is it possible to deny access to a user (in my case www-data) from outside the network? Or possibly deny this: ssh www-data@example.com But allow this if already logged in: su www-data
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2answers
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Puzzle: transfering files between two servers (ssh, ftp, http multipart…)

A puzzle: files being uploaded in realtime by SCP to SERVER1 need to be transfered to SERVER2. But: SERVER1 doesn't actually have network access to SERVER2 (NAT), however SERVER2 has SSH access to ...
2
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2answers
167 views

Run a ping command on list of servers and output to a file

I have a file servers.txt on a different server, with list of servers: server1.mydomain.com server2.mydomain.com server3.mydomain.com I want to first download this txt file, ping these servers and ...
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2answers
72 views

Combine Two SSH Commands

The first ssh command is done on my computer, I enter the key password, then put the second ssh command in while logged into the server. ssh -i cloudkey -L 6000:localhost:6001 admin@54.152.188.55 -p ...
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2answers
38 views

How can Bash determine if it is running due to an rsync over ssh?

I need my Bash init scripts to be able to distinguish between having been invoked like ssh me@host /some/complicated/operation, and having been invoked like rsync -e ssh /src me@host:/dest In the ...
2
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1answer
129 views

Issue with ':' character in Bash script over SSH

I am currently writing a script that will perform backups on a set of databases, comress them, encrypt them, transfer them to a separate storage machine, and verify that the file made it successfully. ...
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2answers
776 views

Different ssh login directory from user home

So, I'm working on a remote server via ssh that I log in and out of dozens of times a day, and I'd like to have bash cd to a default directory I've chosen as soon as I login, but I don't actually want ...
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1answer
5k views

How to save an SSH key passphrase in gnome-keyring?

I want to save an SSH key passphrase in gnome-keyring and then use it automatically when I need it. How to do this?
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3answers
2k views

How to find md5sum of files on remote machines by doing ssh?

I am running my below shell script on machineC which gets the md5sum of my files in my PRIMARY directory in machineC itself. #!/bin/bash export PRIMARY=/data01/primary for entry in "$PRIMARY"/* do ...
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2answers
147 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 ...
2
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1answer
150 views

What commands does git use when communicating via ssh?

Using command="" in authorized_keys, I can restrict the commands that can be run by a particular key. What commands do I need to allow in order to have a functioning git remote? From the Pro Git ...
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2answers
592 views

How can I ssh to a remote server with an automated password and no key?

I have a remote server. I planned to use public keys to connect over ssh without typing the password but the remote system rejects public key authentication. So what is the best way to do it? What ...
2
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1answer
389 views

View blocked address from sshguard

How can I view all the addresses that sshguard has blocked to iptables?
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1answer
493 views

SSH Setup - How will the router know my computer's ip?

I'm very new to the networking side of the house and am trying to set up SSH on my new Ubuntu machine. I have my DD-WRT router working with DDNS now and can log in to the router page -- but I'm not ...
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3answers
421 views

Why is an application via 'ssh -X' slower than vncviewer via 'ssh -X'

Very simple question with strange effect: If I run a programm via x-forward it performs very bad when it comes to animations. E.g.: ssh -X <USER>@<SERVER> "application" But if I start ...
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3answers
1k views

How to execute applications in existing X window from virtual console?

I run Debian Wheezy and have Xfce as my X-Window Manager on virtual console 7, which starts up automatically. Once I've logged on and I'm using the xfce interface, is it possible for me to press ...
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2answers
4k views

Can a shell script running in a ssh continue to run if the SSH instance closes? [duplicate]

I'm trying to write a shell script that does a lengthy batch job on a remote server. I'll be running the script over SSH. The thing is, I intend to start the script in the evening and collect the ...
2
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1answer
510 views

ssh/scp works but rsync just constantly says “no”

Hi I have a windows 2003 server that I need to back up onto a linux client so I install cygwin on the Win2k3. On the Win2k3 I have enabled ssh, scp but (because the Win2k3 server uses an customised ...
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2answers
2k views

SSH public key login: two different keys and SSH_AUTH_SOCK behaviour

A user (user1) on an Ubuntu 12.04 desktop has two SSH RSA keys configured: ~/.ssh/id_rsa and ~/.ssh/id_rsa1 (and .pub files). Both public keys are configured in the authorised keys on the server's ...