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

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3
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2answers
2k 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
votes
1answer
2k views

pdsh command failed with connection refused

I'm able to remote login the target host with ssh. But when I execute a command through pdsh, it fails with connection refused. Both systems are sles11. I found a description of the error on this ...
2
votes
1answer
996 views

Route only ssh traffic through VPN

Is it possible to route a computer's SSH service through a VPN connection but allow ALL other data to exit through the WAN address? What sort of iptables magic needs to be done to accomplish this? ...
1
vote
2answers
461 views

SSH agent loses keys after logging out

I added my SSH key having typed ssh-add ~/.ssh/id_rsa and ssh-add -l printed my key. But after logging out and logging in again I see The agent has no identities. I've tried setting a very ...
0
votes
1answer
54 views

UUOC with ssh file transfer

Just wondering; is it possible to skip the cat in some_command | ssh remote 'cat > outputfile' ? It feels like a UUOC.
1
vote
1answer
216 views

Cannot connect to ssh from crontab

I can create ssh connection from the command line with this command(without password): ssh -R 9900:localhost:22 user@host I need to run this command whenever the system reboots, so I put it in a ...
4
votes
1answer
921 views

Line endings when using GNU Screen

I'm seeing some slightly odd behaviour when using GNU Screen 4.00.03 on a Red Hat Enterprise Linux 6.4 system. If I connect without Screen, looking at the logs I can see each line is terminated with ...
1
vote
2answers
11k views

Colorful ssh banner

I would like to colorize my ssh banner. I know I can perform it like so: In /etc/profile I can put: echo -e "\e[1;31m Colorful text" echo -e "\e[0m Reset" But I have some ASCII art in the banner ...
0
votes
2answers
893 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 ...
5
votes
3answers
2k views

ssh will sporadically hang temporarily on fast connection

I am using Ubuntu 13.04 on my laptop, connected to my router at home. When working from home, I will ssh into the servers on campus, through a vpn, with X11 forwarding. ssh -X ...
3
votes
4answers
18k views

X11 forwarding not working from putty and XMing to centos 6.4

I have centos 6.4 running on VirtualBox. I can connect to it via putty just fine. However X11 forwarding is not working. I Have Xming 6.9.0.31 running and putty 0.62 is setup for X11 forwarding: ...
6
votes
1answer
9k 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 ...
1
vote
1answer
477 views

Possible sftp connection behind a router that is impossible to open any public ports except some standart ports like http?

I want to ask about the problem that I have with my office computer. I cannot reach the router so I cannot redirect any incoming requests to my PC. I have to get a huge file from another computer on ...
3
votes
2answers
435 views

Why doesn't the ssh command follow RFC on URI?

The RFC: Uniform Resource Identifier (URI) Scheme for Secure File Transfer Protocol (SFTP) and Secure Shell (SSH) presents the SSH URI as: ssh://[<user>[;fingerprint=<host-key ...
0
votes
3answers
132 views

When you ssh into a server, do you use server settings or your own settings?

So say I'm running a Linux server that is running irssi in a tmux session.(Detached) My question is, when I ssh into the server and reattach the session, will my shortcuts that I use on the 2nd PC ...
2
votes
2answers
8k views

how can I find out my server's subnet mask via SSH

Hi I use media tamples dv server... I connected it via SSH with putty.. I need my server's IP address and subnetmask. I know the IP address but I don't know the subnetmask. How can I find out my ...
2
votes
1answer
340 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 ...
6
votes
1answer
258 views

Does fail2ban offer any additional protection to SSH if password login is already turned off?

I’m setting up a Debian VPS on Linode to use as a public web server, and I’m following their security suggestions. The last suggestion they make is to install fail2ban, to avoid dictionary attacks on ...
2
votes
1answer
389 views

Checking if passwordless ssh authentication is possible without permission for sshd_config

Is it possible to check if authorization authentication with keys is available without permission to read ssdh_config ?
-1
votes
1answer
467 views

SSH screen (CentOS) crashes

I use the screen command to run a Minecraft server on my CentOS 6.4 machine. However, once I end the SSH session, the Minecraft server and the screen will eventually simply stop such that when I come ...
1
vote
3answers
870 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 ...
2
votes
0answers
2k views

How to run ssh -t user@remote 'sudo nohup bash -c “comand”' in background

I want to run a script on a remote host with sudo privilege, someone suggests that I should use nohup and ssh -t, like the following command: The script ls; sleep 10; echo finish is crafted here to ...
2
votes
1answer
322 views

Is it possible to x-forward windows apps to linux if windows PC running Xming?

I have been digging around looking for an answer to my question but have no been able to come up with anything. I know that xming server allows you to transparently run linux applications on windows ...
2
votes
3answers
519 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 ...
2
votes
3answers
571 views

Log in with specific shell at terminal login

If I log in to a system over ssh, I can use the default shell with a simple ssh user@host, or specify something like ssh user@host 'bash --norc --noprofile' or ssh user@host ksh. Is it possible to ...
2
votes
3answers
154 views

Can I bridge “backwards” from an ssh connection to my local emacs-server?

I'd very much like to log in to a remote machine with ssh and via the $EDITOR environment variable (or something similar) be able to edit in my local Emacs. In this case, specifically for when I log ...
1
vote
1answer
336 views

Why is sshd looking at a non-existent public key file?

In an effort to get SSH keys working I'm tailing the sshd authorization log and I see these lines: debug1: test whether pkalg/pkblob are acceptable debug1: temporarily_use_uid: 10144/10029 (e=0/0) ...
17
votes
3answers
16k views

What difference between openssh key and putty key?

I've found that ssh-keygen ("ssh" package) produces different keys from puttygen ("putty" package). If I create public and private keys with ssh-keygen some ssh-servers will not accept my keys. If I ...
2
votes
1answer
749 views

Cannot open GUI after ssh -X and chroot

I ssh ( with -X option ) to another computer then I I do a chroot. I then encounter problems running X11 apps. As one example, after the ssh I would run emacs and it would open a new window as a X11 ...
0
votes
1answer
208 views

Indirect SCP connection

I use ssh and scp to connect to a remote server. Due to a ip/proxy limitation on the remote server, I have to connect first to another server. For example, if I want to connect to "SERVER-A", I have ...
0
votes
0answers
132 views

PBX randomly loses network connectivity and restores itself

I'm using a QBX appliance, which is just a microATX desktop system with FreePBX connecting to asterisk and some other slapped together stuff running on CentOS 5.4. It's horribly out of date (which I ...
2
votes
4answers
15k views

SSH is suddenly not working anymore: “Write Failed:Broken Pipe”

I use a macbook pro at home and regularly ssh into the machines at my lab. For the past 3-4 days however, whenever I SSH into the machine in the lab, I get a Write Failed:Broken Pipe error, hardly ...
1
vote
3answers
363 views

Upgrade MySQL 5.0.88 to 5.1.69

I am upgrading my MySQL installation on a Fedora 10 (and 14) box (in test first.) I have made a system image (it is a VM) and have downloaded MySQL Server Community 5.1.69-1 from the MySQL site. Once ...
2
votes
1answer
118 views

How can I use ForwardAgent with keychain, or detect a new login?

My scenario: I have Server A at home, and Server B at my parents house. I also have Laptop A and Laptop B at home. I do all sorts of strange ssh hops - I might connect Laptop A -> Server A -> ...
0
votes
1answer
616 views

Counting files on a remote server with ssh and an expect script

Below is my script to take count for files which are present in remote server. But it is not working. Please help me. #!/usr/bin/expect spawn ssh sduser@172.0.0.2 expect "123" send "123" interact ...
2
votes
2answers
293 views

Automatically unlock keys on a remote host accessed via SSH

On my local PC my ssh keys are automatically unlocked on login. From there I access via ssh (with key authentication) a server that have stored the same keys I have in the client. I'd like to unlock ...
3
votes
1answer
523 views

How can I silence ssh-agent?

I have a script like this one at my .bashrc file at the mysuer home: eval `ssh-agent` ssh-add /path/to/my/key The problem is I have this output when I log with the user mysuer (su - myuser): Agent ...
3
votes
2answers
7k views

SSH login via IPv6 successfull while using IPv4 to the same host yields “Permission denied”

I'm currently stumped by a strange problem… I have a dual stack host to which I want to SSH. If I connect via IPv6 everything works like expected datenwolf@foo ~/ > ssh -6 bar.example.com ...
0
votes
0answers
33 views

SSH remote command execution: get output before execution ends [duplicate]

Consider the following simple C program test.c: #include <stdio.h> int main(void){ printf("foo\n"); sleep(5); printf("bar\n"); return 0; } The program prints ...
3
votes
2answers
87 views

Specify script to run with SSH upon login

I would like to know if there is a way to specify what script to run (on the remote machine) at login. I'm logging into a Debian box with key-pair authentiation (no password needed). The script ...
5
votes
1answer
2k views

How many users does Linux support being logged in at the same time via SSH?

I know Linux supports multiple users being logged in at the same time. But what's the maximum number of users that can be logged into Linux at the same time? I see there are there are 69 tty files ...
7
votes
3answers
876 views

Special character '#' in Perl SSH command

I try to send command using SSH in my perl script with # but it gets truncated right at # Example: Input text is : $message = "Product ID # STK000134" The SSH command is : $execute=`ssh -q ...
1
vote
1answer
187 views

Why does rsync look for DSA instead of RSA key when run from cron job?

I want to backup files from a server to my local computer using rsync. I can only log-in to the server with an RSA ssh key. I have stored the passphrase to the key in Seahorse Passwords and Keys, ...
0
votes
2answers
452 views

SSH connections not accepted after configuring NFS?

I have a couple of servers in a VPC in Amazon EC2. One of them acts as a NFS server, and one of them as a client. I recently noticed a problem in the client that after a reboot, it would reject all ...
1
vote
0answers
3k views

Using sshpass, return code (exit status) differs for reasons unknown using valid commands

There are a few things going on here but I think ultimately, either CLish or SSH is returning an exit code that is messing up my work flow. I'm attempting to connect to a remote machine (CLish shell) ...
3
votes
1answer
2k views

ssh-add -D doesn't erase stored keys from the ssh-agent

How come this happens?: stan@tcpc:~/.ssh$ ssh-add -l 8192 e0:45:5e:cc:45:3e:17:2b:a6:54:6f:8d:53:1b:j2:e3 github (RSA) 2048 25:41:53:a6:45:5d:ac:eb:5c:45:f8:ce:42:a9:he:aa BITBUCKET (RSA) ...
12
votes
5answers
931 views

what's the purpose of ssh-agent?

I've read the official definition: ssh-agent is a program to hold private keys used for public key authentication (RSA, DSA, ECDSA). The idea is that ssh-agent is started in the beginning of an ...
1
vote
1answer
479 views

Why ssh -nq -t can't see my environment variable?

I am executing a command on remote machine with -t flag ( to prevent the command from 'blocking' ) the prompt (somehow it works that way). So I am using ssh -nq -t root@ip but with this, the script ...
0
votes
1answer
245 views

I'm able to remotely ssh into Cygwin on XP, but it warns “Could not chdir to home directory” and my /bin is almost empty

I've made a firewall exception, opened ports 22 through 443 to the correct internal IP (I think), and am able to log in using my external IP, but it's like I have very limited view access to almost ...
2
votes
1answer
169 views

SSH lets me login with a password even though I set “PasswordAuthentication no”

I'm trying to turn off password authentication for SSH after setting up public key access. I have these set in my /etc/ssh/sshd_config file: PermitRootLogin without-password PasswordAuthentication no ...