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

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Logging in through ssh tunnel with rsa key still giving password prompt

I have two laptops (Host A and Host C) with dynamic IP addresses and one desktop (Host B), all of which are running (Ubuntu) Linux. Right now I have things set up so I can access Host A from Host C as ...
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1answer
34 views

Hop scp and sshfs using ssh tunnels

Here's what I have: A desktop and a laptop both behind a firewall, both of which can connect to an ssh capable server. Here's what I can do: Create a tunnel from server to desktop by running this ...
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1answer
570 views

Forwarding X11 not working - Error: Can't open display: localhost:11.0

LM 17 Xfce OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 Despite googling everywhere, I cannot seem to get this to work. I keep getting this error. $ xlogo Error: Can't open display: localhost:10.0 I have tried ...
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0answers
29 views

Is it possible create a ssh jail with gcc and g++ access? 14.04 Ubunutu

I would like to share server access with my computer science cohort and I wanted to know if its possible to create a ssh jail with gcc g++ access. What are best practices and how might you create ...
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0answers
63 views

openssh-server doesn't start in Docker container

I am having a weird problem. I am not able to ssh to docker container having ip address 172.17.0.61. I am getting following error: $ ssh 172.17.0.61 ssh: connect to host 172.17.0.61 port 22: ...
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1answer
47 views

automatic ssh connection with use the passphrase key

I use the key pair with passphrase for the host connection on ssh. Is it possible to specify this passpharase in ssh_config on the client?
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1answer
36 views

How do I transfer files over ssh and also change their permission on the remote server without having to log in twice

guy@home~% scp file.* guy@server.server.com:/users/guy/public_html/kool-stuff/ Ok so this transfers some files. Then I usually have to login in another terminal and do this in order to make them ...
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1answer
54 views

I am accessing remote machine in linux using Bash scripting

I am accessing a remote machine using the ssh command and a pem file. My code is as follows: #!/bin/bash ssh -i rijo.pem ubuntu@90.45.74.51 <<EOF sudo -s var=`cat ...
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1answer
30 views

SSH not giving indication that the public key is being used for login

I have a public key to log on to my server. This key is password protected. However, when I log in to my server, there's no indication that the key is ever used. I just log in with my password as ...
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0answers
46 views

Can I “hijack” a UNIX shell from another login? [duplicate]

Let's say I'm starting a job in a Unix terminal on a machine (a Mac if it matters), and this process does a lot of things and keeps printing output to the terminal. Then I go to another machine and ...
0
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1answer
25 views

Directory .ssh problem [closed]

I have been trying to Create a Directory .ssh in /home/user/.ssh and I keep getting error file directory already exist. I have not created .ssh directory. I have been using mkdir /home/user/.ssh How ...
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1answer
55 views

Connection lost to VPS While using iptables by default policy as DROP for INPUT, OUTPUT, FORWARD

I'am using iptables in many server's but now stuck with this issue while using default Policy as DROP. Here is my rules which i have used in VPS, Tried many time's everything seems fine but VPS ...
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1answer
122 views

awk in ssh in su in a command substitution

I am creating a script that will ssh to a host and print all the user accounts and when they will expire. On a host I can run awk -F':' '{ print $1}' /etc/passwd and it will give me a list of all ...
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6answers
160 views

What are the Implications of Passwordless SSH

If UNIX users reach servers via SSH, and we only want to allow pubkey logins, are there any other items that need to be added to this list, that I should be concerned with? Allow pubkey login in ...
3
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1answer
285 views

Changed SSH port without allowing it through firewall, locked out now - what to do?

I have a VPS where I changed the SSH port from the default 22. Unfortunately I forgot to allow the new port through the firewall. I don't have physical access to the server, and my host does not seem ...
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0answers
144 views

Debugging ssh: slow, but fast with -t [closed]

Just today my server has started being slow at ssh login when a terminal is not requested. The delay seems to be random between 0 and 40 seconds and is reproducible every time. The surprising part is ...
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1answer
64 views

block from SSH and FTP

yesterday i was upload some images using filezilla to my VPS , and today when i tried to login into my VPS i got connection time out , same thing when i tried to access using FTP. but i can acces ...
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0answers
107 views

Why does having cron run a remote command over ssh on a Cisco router get interrupted?

I have been tasked with making sure that if a particular server at work dies, we know about it right away. Because I'm not there (no one is really), I have written a script to run on my home router ...
5
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1answer
69 views

HURD: Why is remote process not killed?

On most UNIX systems this will not leave a process running: ssh example.net sleep 1000 <<CTRL-C>> I have tested this behaviour on aix centos debian dragonfly freebsd hpux irix mandriva ...
3
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1answer
66 views

What is the difference between letting nohup append to 'nohup.out' and explicitly redirecting it to a file?

Consider the following scenario: tail.sh: #!/bin/bash tail -f test.txt invoke.sh: #!/bin/bash nohup ./tail.sh & invoke_explicitredirect.sh: #!/bin/bash nohup ./tail.sh > out.log & ...
2
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1answer
62 views

Concatenate and pass as parameter, bash

Need some help with removing default gateway. For example, there is an IP 192.168.4.15 with default gateway 192.168.4.14. I connect to WLAN with gw 10.0.0.1 and after that I would like do remove ...
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0answers
51 views

Why is my SSH authentication socket different from the man pages?

These two entries of man ssh-agent describe the SSH authentication socket: $TMPDIR/ssh-XXXXXXXXXX/agent.<ppid> UNIX-domain sockets used to contain the connection to the authentication ...
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0answers
26 views

Mosh and terminal multiplexing

Reading this Q&A on the site: Can I re-attach to a mosh session? made me wonder about the use cases for mosh. Say I start tmux on my local client, and then mosh to a remote host from within ...
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1answer
30 views

Mosh to a specific remote shell

With ssh, I can do something like the following: ssh user@host -t /path/to/some/shell How can I automatically launch a shell on the server with mosh? I have tried with mosh user@host -ssh ...
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1answer
87 views

Sudo command not working on Intel Galileo Gen 1

I have an Intel Galileo Gen 1 Arduino board and I am using it over SSH with Ethernet. When I try to use the sudo commands the bash terminal reports this, a missing command! I am using the bigger Linux ...
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1answer
54 views

How to disable GUI for password promt in Gnome

I moved from Xubuntu to Debian and copied id_rsa and id_rsa.pub to ./ssh/ I use a passphrase protected certificate to log in to a remote server. My passphrase contains arrows. Somethin like "Mike" ...
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1answer
50 views

Does a Linux server use swap space of an SSH client? [closed]

I currently am SSHing into a Linux server via my mac's terminal program. Afterwards, I run whatever simulations and calculations I need to do. However, I noticed that after I log in, it says on the ...
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1answer
113 views

Can't change gnome-terminal tab's title from within ssh session on remote debian 8 machine

When I connect to a debian 8 server I can't change gnome-terminal tab's title, see for yourself: $ ssh deb6-server $ echo -en '\e]0;test\a' # title changes $ echo $TERM xterm-256color $ cat ...
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1answer
45 views

Ugly bash function to send commands and “say” anything in screen over ssh. Is there a better way?

I’m working on a function this works but it is ugly. One thing that could be changed is being able to know the name of the screen. Using screen -dms minecraft java ….jar now starts a screen session ...
6
votes
1answer
143 views

Cannot run cryptsetup throught SSH?

I'm trying to open a LUKS drive through SSH directly. ssh root@XX "cryptsetup luksOpen /dev/sdb3 secure But, no password prompt and it stuck. debug1: Sending command: cryptsetup luksOpen /dev/sdb3 ...
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75 views

Establish reverse ssh tunnel at OS startup / network connection up

I'm trying to setup a reverse SSH tunnel using a middle-man, due to firewall restrictions. I took the following steps: from ssh server do reverse tunnel: ssh -R 8080:localhost:22 ...
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1answer
262 views

Remote ssh command not sending echo variable from a ksh script on AIX

I'm need to get the value of a variable from a remote host in a script using SSH and have to source an environment file first that does a shift at the end of its run. The command works locally and I ...
0
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0answers
30 views

Is there a large performance difference between find and find2perl

Is there a performance difference between find and find2perl? I work for a hosting company and I was told that our admins prefer us to use find2perl over find. Supposedly this is because find is ...
1
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1answer
40 views

How does 'ssh-copy-id' work under the hood?

What does the program ssh-copy-id actually do under the hood? Can the steps be explained as if to a child with a good understanding of computer science? Does it use protocols already existing in the ...
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5answers
735 views

Use two different ip addresses per host in SSH

I have a server, named gamma, constantly up and running at work. Sometimes I connect to it from at home, in which case I use the public IP address 55.22.33.99. Sometimes, I connect to it when I'm at ...
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0answers
44 views

X forwarding from a mac to Linux fails

I have been having problems recently while trying to ssh into linux servers (Ubuntu 14.04) from my mac (OSX Yosemite 10.10). This used to work fine until my latest update, where I systematically get a ...
2
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1answer
62 views

What will happen if I export my $HOME variable upon login?

This is a follow up from this question: http://askubuntu.com/questions/563828/how-to-change-my-home-directory?noredirect=1#comment775654_563828 The summary is: running ubuntu 14.04 ssh'ing into it ...
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1answer
134 views

How can I use SSH to tunnel Minecraft clients to my MineOS server?

I have a MineOS Turnkey server running on my university's network and its locked behind their firewall. I have been able to connect to their Linux servers using SSH and then SSH to my server from ...
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2answers
302 views

How to decrypt hostnames of a crypted .ssh/known_hosts with a list of the hostnames?

I try to find a script to decrypt (unhash) the ssh hostnames in the known_hosts file by passing a list of the hostnamses. So, to do exactly the reverse of: ssh-keygen -H -f known_hosts Or also, to ...
1
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1answer
54 views

Preventing user from accessing parent folders [duplicate]

I have a user who I only want to be able to access /var/www/ucp/ (his home directory). I have executed the following command on the / directory, the /var/ directory and the /var/www/ directory: chmod ...
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2answers
45 views

Safe way of letting users upload their public keys

I need to let untrusted users, strangers, upload their id_rsa.pub to my server and onto a given user's authorized_keys (user git in my case). What is the safest way of achieving that, without having ...
1
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1answer
125 views

Run a GUI application in background and reconnect later [duplicate]

Is there a way to run a Gui application (X11) in background so that if I disconnect, I can resume the running app again? I am using SmarTTY on windows to connect to remote CentOS. When I run a Gui ...
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0answers
510 views

CentOS 7 add new user with root privileges

I am reading this tutorial, and trying to create a new user with root privileges and then block root access via ssh in a CentOS 7 server. The problem is that the new user is blocked from doing root ...
3
votes
1answer
201 views

Connecting SSH and Git to gpg-agent

I'm running a YubiKey NEO with the OpenPGP applet to store my GPG keys on the smart card. I've stopped all other SSH and GPG agents manually by removing their startup entries (On elementary OS Luna, ...
2
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1answer
89 views

upload and dowload the files from server without giving password

I want to download the file from sever by using cron job, so I need to use scp command without giving password by keyword. How do I do so?
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67 views

SSHD_CONFIG keeps corrupting on reverse SSH setup

I have a reverse SSH setup to traverse an impenetrable CGN NAT. It works well, but the SSHD daemon on the client behind the NAT keeps dieing for unknown reasons (fails to start-up). The client ...
0
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1answer
140 views

Create A Script That Responds To A Password Prompt

I'm writing a shell script that will respond to a prompt. For example, when I execute a file, the executed file will then prompt the user with this: Please enter the password: Then I want the script ...
2
votes
1answer
51 views

encfs automount and authorized_keys

Here's my problem: I have encfs configured in such a way that on login the subfolder ./private is mounted. However, when I use the workstation remotely via ssh, I don't give my password on login, ...
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2answers
38 views

How to instablock IP based on root SSH login

I have had this setup before by a friend of mine but it got lost in a reinstall. Basically what happened was, whenever someone would directly SSH to my server as root their IP would get blocked, you ...
0
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1answer
25 views

SASL authentication fails when called from crontab

When I run mbsync from the command line it works fine. But if mbsync is run from the crontab, mbsync fails with this error "Error: SASL(-1): generic failure:". My guess is that mbsync's SASL ...