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

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56
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6answers
78k views

ssh-add complains: Could not open a connection to your authentication agent

I've been trying to get ssh-add working on a RaspberryPi running Raspbian. I can start ssh-agent, when I do it gives the following output into the terminal: ...
1
vote
1answer
96 views

Determine the target of an SSH connection at runtime

I want to determine the target address of an SSH connection with a function call that generate the address to connect to. All of the examples using ProxyCommand that I can find online use the -W flag ...
2
votes
2answers
99 views

Reverse X11 Forwarding without SSH on server

I want to run an X11 program on the SERVER and display the window on the CLIENT. I have a shell on the server to start with. (This is not an SSH shell, but some cluster computing software) The ...
28
votes
7answers
12k views

Can I find out which ssh key was used to access an account?

Is it possible to find out which ssh key was used to access an account? I have an account on a server that I let several (trusted!) people have access to via ssh. I'd find it useful to be able to ...
1
vote
1answer
69 views

How to ensure ssh via cgroups on centos?

When some cpu-intensive processes are running on the server, chances are that we could not log in to this machine with error 'operation timeout' via ssh command. According to this post answered by ...
2
votes
1answer
54 views

Detect remote sshfs mounts on local machine

I would like to get back the question of this post. When a user in a remote client mounts a directory from a local server on his filesystem through sshfs, he is not visible in the server through who ...
3
votes
2answers
107 views

-X flag (X11 Forwarding) does not appear to work in Windows

I am using Open SSH (OpenSSH_6.6.1p1, OpenSSL 1.0.1i 6 Aug 2014) in Windows 8.1. X11 Forwarding does not appear to be working. The DISPLAY environment variable does not appear to be set. For ...
2
votes
3answers
80 views

Pasting some text with tabs into a here-document in a PuTTY window

I have a string with tab delimited data that looks like: h1 h2 a1 b1 a2 b2 I produced it with Notepad on Windows. I created tab delimited data, ensuring that tabs and not spaces are used. I ...
12
votes
3answers
28k views

How to ensure SSH port is only open to a specific IP address?

This is my /etc/sysconfig/iptables: It has two ports open 80 apache and 22 for ssh. # Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. ...
0
votes
1answer
38 views

bash script failing to use ssh -i. Can't see directory

I am experiencing something strange. I am working on a script to remote install Splunk on servers via a script. In this script I ssh to my practice servers (5 amazon EC2 instances running Redhat). ...
0
votes
0answers
52 views

X11 connection rejected because of wrong authentication for one display number

As stated in the title, I am having this error when I have ssh into a remote server with a certain display number assigned. There is not X11 forwarding problem since I can use GUI application as usual ...
0
votes
1answer
40 views

How to change password of an ssh identity file

Can I, and in that case how can I, change the password of an SSH identity file without having to generate a new key and setting up it all over again?
8
votes
3answers
42k views

Shell Script for logging into a ssh server

I tried writing a shell script which can do automatic login into a ssh server using password which is mentioned in the script. I have written the following code: set timeout 30 /usr/bin/ssh -p 8484 ...
0
votes
1answer
58 views

Disable scp for all IP, but allow it for given ones

There is a server running sshd. We have root permission on it. Question: How can we disable SCP on it, BUT: allow a given IP to SCP (copy to it, etc.) Maybe rename the SCP binary and have a "Match ...
42
votes
4answers
7k views

Why is root login via SSH so bad that everyone advises to disable it?

Everybody on the Internet advises to disable root login via SSH as it is a bad practice and a security hole in the system, but nobody explains why it is so. What is so dangerous in enabling root ...
0
votes
3answers
147 views

Running remote script via ssh command

I have a script on remote Debian server machine and I want to run a command by invoking: ssh server "find.sh" My find.sh script is in in: /home/user/bin First of all, I ran ssh server "echo ...
7
votes
2answers
376 views

SSH key authentication with multiple computers

I was reading about SSH key authentication and setting it up with my 3 computers at home. I have one main computer, call it "A", and two others, call them "B" and "C". Now based on the documentation ...
1
vote
2answers
47 views

How can I automatically stop putty disconnecting

Unless I set "Seconds between keepalives (0 to turn off)" to 2 putty keeps disconnecting after a few minutes of inactivity. How can I fix this once and for all? I can't find where putty settings are ...
1
vote
1answer
44 views

Transfer data over SSH directly in Truecrypt volume

my problem is this: I have to transfer data from my computer to a remote system that doesn't have an encrypted partition. Because I don't want that the transferred data can be retrieved by forensic ...
-2
votes
1answer
45 views

ssh not working for all logins

I was doing a cleanup and by mistake i deleted some dir from /var which resulted in a situation that no other session /ssh is possible . When I am trying from ILOM via vsp -- says Error Service Module ...
1
vote
1answer
62 views

Lsyncd not working on Mac 10.9

I'm attempting to use lsyncd to automatically move files to my local development server. My host is OSX 10.9. SSH on the server works. I can connect using ssh from the host. I am using an SSH key to ...
3
votes
0answers
57 views

X11 forwarding but open links locally

I have X forwarding between two machines. I doubt it matters, but the local machine is Windows running PuTTY and Xming. Is there any way that I can click a web link on a remote application and have ...
2
votes
1answer
116 views

Connect to server to remotely access a Linux computer via GUI

I'm working from home on my laptop which runs on Ubuntu and I would like to access my work computer which runs on Mageia. Usually I just gain access through terminal like this: ssh -p <port> -X ...
0
votes
3answers
180 views

Can a command be executed without a shell?

I am developing a binary executable program command to execute programs and return the output into a text field. The parameters to the command involve the command itself as it would be typed on the ...
1
vote
1answer
33 views

Set xterm title doesn't work over ssh

I followed unix s.e post and added the line, trap 'echo -ne "\033]0;$BASH_COMMAND\007"' DEBUG to my .bashrc file to set my last command as the terminal title. It works good on my ubuntu desktop ...
8
votes
3answers
2k views

GNU screen freezes trying to reattach

I have several long-running GNU screen sessions. I ssh to the box they're running on and run screen -d -r foo to detach them if they're connected anywhere else, and then attach them in my current ...
5
votes
3answers
15k views

bash: /home/user/.ssh/authorized_keys: No such file or directory

Create a ssh key: $ ssh-keygen -t rsa –P "" Moving the key to authorized key: $ cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys bash: /home/user/.ssh/authorized_keys: No such file ...
4
votes
0answers
69 views

Restart a specific reverse ssh tunnel?

I have multiple machines in the wild that open reverse ssh connections to my server. Each machine out there is using a different reverse ssh port, which I use to differentiate between the machines. I ...
2
votes
1answer
41 views

Is sshd_config TPCKeepAlive still using unencrypted channel and therefore vulnerable

This post from 2008 in ubuntuforums recommends disabling TCPKeepAlive Disable TCP KeepAlive messages. These messages are spoofable and are sent outside of the encrypted channel, and ...
4
votes
1answer
92 views

Uselogin in sshd_config

I was looking through my sshd_config file and I found this: #Uselogin no I know it's commented but there is no explanation above it and when I google it, I get this: Don't use the traditional ...
1
vote
0answers
12 views

GUI SELinux security alert window don't shows up?

I created an error I broke ssh service on my system to see why security context must be properly configured. I used next commands: # service sshd stop # chcon --reference /root/anaconda-ks.cfg ...
5
votes
2answers
112 views

How are terminal length and width forwarded over SSH and telnet?

When I view the length and width of my terminal emulator with stty size then it is 271 characters long and 71 lines tall. When I log into another server over SSH and execute stty size, then it is also ...
0
votes
1answer
54 views

SSH from different countries with openvpn configured on pfsense and dd-wrt?

I have vpn set up in two different countries A (primary, where I live) and B (secondary, which I visit once or twice a year) and would like to SSH to my devices across the vpn. My Setup: Country ...
0
votes
0answers
14 views

iptables presale me to ssh access or calling methods remotely

I have a linux openwrt unit. At its start, I can not make a ssh access if I do iptables -F. If I use iptables -L -n -v, I find several rules that are automatically inserted and it prevents me from ...
110
votes
19answers
145k views

Why am I still getting a password prompt with ssh with public key authentication?

I'm working from the URL I found here: http://jaybyjayfresh.com/2009/02/04/logging-in-without-a-password-certificates-ssh/ My ssh client is Ubuntu 64 bit 11.10 desktop and my server is Centos 6.2 64 ...
1
vote
3answers
832 views

Force ssh to not to print warnings

Is there a way to avoid ssh printing warning messages like this? "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r", "@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @\r", ...
5
votes
1answer
155 views

Fast drop-in replacement for “ssh -X”

I'm looking for something to provide faster X11 fowarding than ssh -X provides. I do not need a full GUI session or the ability to drop/resume user sessions. I use NX regularly, but as far as I can ...
2
votes
1answer
30 views

How can I have ssh-agent warn if using a particular key?

I have an older SSH key that I'm replacing, and I would like ssh-agent to warn me if it used the older key, so I know to update it on that server. Is there a way to do this?
1
vote
0answers
113 views

SSD installed, but shows as HDD in command output

Strange issue here. I have a 480GB SSD drive installed in this server. I installed it myself. I see it, it's there. But, I'm getting an incorrect output on a typically used command to determine if ...
2
votes
3answers
3k views

Can't SSH into Any Server

I work on remote servers frequently, but for some reason I cannot discern, today I am unable to ssh into anything. Everything comes back with Write failed: broken pipe. I know this is a common ...
0
votes
1answer
127 views

SSH Server Not Responding to Connection Request

I'm attempting to set up an SSH server on my local machine using OpenSSH. When I try to SSH from a remote host into my local SSH server, the SSH server doesn't respond and the request times out. I'm ...
8
votes
5answers
23k 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 ...
1
vote
0answers
60 views

nmap doesn't detect opened port [closed]

I'm testing some vulnerabilities on a machine which has the port 22333 opened (it's used as the ssh port, and I can connect to it without any problem and I can get connected as well with the telnet ...
1
vote
2answers
78 views

iptables configuration - ssh connection only from a remote network

I'm trying to configure Iptables of a server in order to permit SSH incoming connections only from a certain network. by the way this is the rule chain : # Drop anything we aren't explicitly ...
4
votes
3answers
151 views

How to browse a website as if I am in USA? [closed]

I am in Taiwan right now and whenever I go to a website that I could browse in USA, it directly transfers me to the Asia site. There is no way to browse the USA version of the site, probably because ...
1
vote
1answer
37 views

What ports will an ssh daemon use outbound?

I am making a bastion ssh server. When I use the following rules in its ip tables, I am able to connect to the server just fine: Inbound Rules Allow traffic on port 22 from my client's IP Block all ...
2
votes
2answers
111 views

chroot ssh users to home directory

How can one chroot ssh users to their home directories? This is what i have set in my sshd_config file: ChrootDirectory %h Subsystem sftp /usr/libexec/openssh/sftp-server ssh version is ...
5
votes
2answers
1k views

command line method or programtically add ssh key to github.com user account

Is there a way to identify with a username and password to github.com servers for the purpose of adding an ssh key to the github user account? So far everything I've read suggests that a users ssh key ...
0
votes
0answers
51 views

scp from a remote machine

I am having trouble moving files off a remote machine that we need to take down. I can SSH into the remote machine just fine but, when I try to scp the files out I get an connection timed out on port ...
1
vote
0answers
30 views

OpenSSH Server as Tor Hidden Service

What exactly is considered best practice when setting up an open SSH server as a Tor hidden service? I do it this way, but I feel like there's a better way of doing this: I just set SSH up as a ...