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

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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 ...
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3answers
3k 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 ...
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4answers
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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: ...
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1answer
11k 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 ...
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1answer
591 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 ...
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2answers
703 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 ...
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3answers
142 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 ...
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2answers
10k 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 ...
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1answer
439 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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1answer
266 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 ...
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2answers
504 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 ?
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1answer
512 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 ...
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3answers
1k 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 ...
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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
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1answer
412 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 ...
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3answers
614 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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3answers
706 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 ...
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3answers
160 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 ...
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1answer
375 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) ...
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3answers
24k 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
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1answer
850 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 ...
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1answer
234 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 ...
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0answers
176 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 ...
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4answers
18k 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 ...
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3answers
405 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
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1answer
129 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 -> ...
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1answer
703 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 ...
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2answers
370 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 ...
4
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1answer
673 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 ...
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2answers
10k 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 ...
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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 ...
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2answers
93 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
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1answer
3k 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
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3answers
992 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 ...
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1answer
209 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, ...
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2answers
578 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 ...
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0answers
4k 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) ...
5
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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) ...
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5answers
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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 ...
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1answer
581 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 ...
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1answer
279 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
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1answer
189 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 ...
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1answer
3k views

Forward all ports SSH

I have a question about SSH/Port forwarding. I haven't found the solution anywhere and don't know if there is any. I have a server behind my NAT box at home. I have port forwarding from my NAT box to ...
3
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1answer
653 views

Having the 'id_rsa.pub' file in my dotfiles public repo securely

So this is something that I'm wondering, how can I have this file in my dotfiles GitHub repo? I'm sick and tired of having to generate a new SSH key every time I'm on a new computer or re-install my ...
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1answer
100 views

ssh private key stops accepting my passphrase

When booting my laptop today I found that ssh (openssh) simply refuses to accept my passphrase when reading my private key. My only idea of how that could've happened is if the HDD has somehow ...
2
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1answer
1k views

Getting no tty present and no askpass program specified when using git over ssh

I'm trying to push a git commit from my laptop to my server but keep getting the following error message: remote: sudo: no tty present and no askpass program specified To ...
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4answers
4k views

How to troubleshoot failed X11 forwarding with ssh?

When I try to establish an X11-forwarding connection to myserver, I get the following error: % ssh -X myserver xlogo X11 connection rejected because of wrong authentication. X11 connection rejected ...
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2answers
70 views

ssh with identical machines

I have two identical beaglebones that I'm working with. They have the same hostname and originally had the same IP, though I changed one to see if that made a difference. They're going to be deployed ...
0
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2answers
46 views

can't update with this error messg

I got this message: not enough free disk space.... The upgrade needs a total of 31.8 M free space on disk '/boot'. Please free at least an additional 31.8 M of disk space on '/boot'. Empty ...
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5answers
19k views

Use socks proxy for commands in terminal

I connect to a remote ssh server by running this command: ssh -D 12345 bob@myserver.com This creates a socks proxy that I can use with Firefox to bypass censorship in my country. However, I can't ...