Questions tagged [ssh]
Secure Shell; a network protocol that allows data transfer over a secure channel between two networked devices.
876
questions
197
votes
10
answers
249k
views
How do I set up SSH so I don't have to type my password?
How do I set up SSH so I don't have to type my password when connecting to a host?
128
votes
8
answers
68k
views
Forward SSH traffic through a middle machine
SSH tunneling is very confusing to me. I am wondering if I can do this in Linux.
I have 3 machines..
A. My local machine at home.
B. Machine at work that I can SSH into (middle man).
C. My desktop ...
PKKid
476
votes
18
answers
475k
views
An SSH tunnel via multiple hops
Tunneling data over SSH is pretty straight-forward:
ssh -D9999 [email protected]
sets up port 9999 on your localhost as a tunnel to example.com, but I have a more specific need:
I am working ...
- 7,388
107
votes
10
answers
203k
views
UDP traffic through SSH tunnel
The title pretty much sums it up. I would like to send UDP traffic through a SSH tunnel. Specifically, I need to be able to send UDP packets through the tunnel and have the server be able to send ...
- 64.1k
352
votes
19
answers
321k
views
How to reliably keep an SSH tunnel open?
I use an SSH tunnel from work to go around various idotic firewalls (it's ok with my boss :)). The problem is, after a while the ssh connection usually hangs, and the tunnel is broken.
If I could at ...
- 6,324
127
votes
5
answers
230k
views
How can I SSH into "Bash on Ubuntu on Windows 10"?
I have Windows 10 Anniversary Edition with "Bash on Ubuntu on Windows" installed and working. I'd like to be able to SSH into this Ubuntu instance, but although I have openssh-server installed and ...
- 1,961
22
votes
1
answer
58k
views
How to create a SOCKS proxy with ssh?
I want to use my computer as a SOCKS proxy. Do you just have to do ssh -D port_number hostname? Do I have to put my Linux username as the hostname?
- 323
469
votes
18
answers
880k
views
Windows SSH: Permissions for 'private-key' are too open
I've OpenSSH 7.6 installed in Windows 7 for testing purposes. SSH client & server work just fine till I tried to access one of my AWS EC2 box from this windows.
It seems like I need to change the ...
- 5,463
15
votes
3
answers
3k
views
Leave bash script running on remote terminal while not logged in?
I have a bash script that takes several hours to run. While it's running, I would like to do other things, which may involve logging out or disconnecting from the internet (my script runs network ...
- 868
95
votes
12
answers
609k
views
PuTTY Network Error: Software caused connection abort
I have a strange problem: When I'm using PuTTY with SSH connecting to a Linux server hosted in VMware on my local Windows 7, I often get the error saying "Network error: Software caused ...
- 1,204
84
votes
4
answers
263k
views
Create an SSH user who only has permission to access specific folders
I installed SSH, but I found if I use my original account to login to Ubuntu, it has too many permissions.
I want to constrain the user to only have permissions for specific folders in Ubuntu. How ...
- 1,939
30
votes
6
answers
109k
views
Connect to Linux by name rather than IP
I'm new to Linux (currently running Ubuntu 10.04) and I have just finished setting up SSH access to my Linux Machine. Currently, I have to use ssh [email protected] to connect but would much rather be ...
- 632
4
votes
1
answer
7k
views
How to execute complex command line over ssh?
I sometimes want to get the env of a docker container running on a remote host. To do this I log into the host:
ssh [email protected]
and then I run this command:
sudo docker exec -it `sudo ...
- 1,424
20
votes
6
answers
56k
views
How to detach ssh session without killing a running process?
I started a test filesystem resize on a server through ssh, but totally forgot to do that on a screen session. Now it is running, and my laptop has very slow internet. Is there any way that I can keep ...
- 361
77
votes
9
answers
134k
views
Unable to change file permissions on Ubuntu Bash for Windows 10
I was trying to use an ssh instance and I received the following error, which is odd since I tried to change the permission using chmod, but that didn't seem to work as permissions were still 777:
@@@@...
- 873
56
votes
1
answer
32k
views
Does the right half of the rsa public key matter?
In a public key file "id_rsa.pub" generated by ssh-keygen, does the part after the == matter?
I ask because when I changed "[email protected]" to "root", it seems to still work.
More generally, I ...
- 2,047
47
votes
3
answers
208k
views
How to run a remote command in PuTTY after login & keep the shell running?
What I'm trying to do: start a PuTTY session from the command line, login to remote machine and cd to provided directory.
putty.exe -agent -ssh some.host
That will open a session & login with my ...
- 573
46
votes
2
answers
71k
views
Can I create an SSH user which can access only certain directory?
I have a Virtual Private Server which I can connect to using SSH with my root account, being able to execute any linux command and access all the disk area, obviously.
I would like to create another ...
- 1,926
13
votes
3
answers
33k
views
SSH into WSL from another machine on the network
I'm trying to deploy a distributed systems using Windows machines. However, the code I want to compile and run on this system should get complied in a Linux-based environment. Thus, I downloaded and ...
- 133
7
votes
1
answer
12k
views
Copy file using scp fails (debug1: Exit status -1)
I wanted to copy a single file from a remote server to my local machine.
I do not have root privileges on the remote machine but I can successfully SSH into a user given the password.
However the ...
- 73
1
vote
2
answers
7k
views
How can I execute a command on a remote server through scp?
When using ssh to access raspberry pi running balenaos, ssh -t -p 22222 root@device-ip "balena-engine exec -it <container_name> /bin/sh" grants me access to a specific container inside ...
- 11
191
votes
16
answers
1.9m
views
How do I fix a "cannot open display" error when opening an X program after ssh'ing with X11 forwarding enabled?
After launching the X11 app (XQuartz 2.3.6, xorg-server 1.4.2-apple56) on my Mac (OS X 10.6.8), opening an terminal in X11 and running xhost +, I then ssh -Y to my Ubuntu 10.04 VM (running on VMware ...
- 8,825
99
votes
4
answers
55k
views
Are GPG and SSH keys interchangable?
I want to generate an RSA key in GPG and use it in SSH login. Is this even possible? If so, how?
edit: see @wwerner's answer, I didn't try it but it seems to be the current solution (as of 2018)
- 1,147
6
votes
1
answer
7k
views
Accessing localhost web server via reverse SSH tunnel and URL
I have a web server running on a local machine and it is easily accessible to all machines on the LAN. I also have a remote server with a public IP address/URL pointing to it (example.com). I cannot ...
- 183
3
votes
2
answers
4k
views
SSH disable port forward remotely instead of killing process on the server
I am making an automatic remote SSH port forward request from my device every few minutes:
ssh -y -f -N -R port:localhost:22 user@server \
-o ExitOnForwardFailure=yes -o ServerAliveInterval=60 \
-o ...
- 91
0
votes
3
answers
2k
views
Move all files in local directory to remote SFTP directory
I want to move all files in local directory to remote directory.
And I am using this code to achieve it
SOURCE_FILE=/var/www/oneserver/*
TARGET_DIR=/var/www/anotherServer
ARCHIEVEFILE=/var/www/...
- 109
252
votes
8
answers
207k
views
How to make an SSH tunnel publicly accessible?
Referring back to this question, I am executing the below via OpenSSH (Client: Mac OS X 10.6 | Server: Linux Mint), however the port that is being tunneled is not working publicly:
ssh -R 8080:...
- 2,661
163
votes
10
answers
195k
views
How to use Mac OS X Keychain with SSH keys?
I understand that since Mac OS X Leopard the Keychain has supported storing SSH keys. Could someone please explain how this feature is supposed to work.
I have some RSA keys that I've generated ...
- 1,778
157
votes
7
answers
276k
views
How can I tunnel all of my network traffic through SSH?
Whenever I'm using the internet from an insecure location (such as public wifi) I like to use an ssh tunnel (ssh -D port host) to ensure my traffic can't be sniffed. Unfortunately, there seem to be ...
- 1
61
votes
2
answers
64k
views
ssh -o PreferredAuthentications: What's the difference between "password" and "keyboard-interactive"?
Both PreferredAuthentications=password and PreferredAuthentications=keyboard-interactive would prompt for the password, so what's the difference between them?
I Google'd with the keywords ssh ...
- 1,000
44
votes
3
answers
76k
views
How can I use ssh to run a command on a remote Unix machine and exit before the command completes?
How can I use ssh to run a command on a Unix machine and exit before the command completes?
For instance, if I type
ssh localhost 'sleep 60 &'
ssh hangs on my terminal until sleep completes, ...
- 12.6k
21
votes
3
answers
49k
views
How to connect to Windows subsystem for Linux from another machine within network?
I set up my Ubuntu WSL instance and am running an SSH server on it. However, when I do ifconfig on the Ubuntu console, my Ipv4 is 172.26.66.223, which is different from my regular machine's ipv4 192....
- 303
16
votes
3
answers
19k
views
SFTP over double server hop
I'm trying to work out a method to allow me to access files on an SFTP server than I cannot access from my local machine. Currently, I have to SSH to a remote server (it is in a certain IP block that ...
- 361
5
votes
1
answer
6k
views
How/why does ssh output to tty when both stdout and stderr are redirected?
I've just noticed that
ssh user@host >/tmp/out 2>/tmp/err
can write something like
Warning the RAS host key...
...
Are you sure you want to continue connecting (yes/no)?
stdout and stderr ...
- 2,198
1154
votes
25
answers
1.5m
views
How to tell git which private key to use?
ssh has the -i option to tell which private key file to use when authenticating:
-i identity_fileSelects a file from which
the identity (private key) for RSA or DSA authentication is read.
The ...
- 12.9k
253
votes
4
answers
460k
views
How to convert .ppk key to OpenSSH key under Linux?
I know that is possible to convert .ppk under puttygen in Windows, but how to do that on Linux? Is this possible ?
- 3,591
151
votes
9
answers
240k
views
How do I make Bash my default shell on Ubuntu?
I have a .bash_profile in my home directory, but it isn't getting run on login. If I do the following, then things seem to be as I expect:
ssh myhost
bash
source ~/.bash_profile
But normally that ...
- 2,282
142
votes
24
answers
247k
views
Why is my SSH login slow?
I'm seeing delays in SSH Logins. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays.
Between issuing the ssh command and getting a login prompt and
between ...
- 1,882
131
votes
15
answers
154k
views
How to force GPG to use console-mode pinentry to prompt for passwords?
Using gpg from a console-based environment such as ssh sessions fails because the GTK pinentry dialog cannot be shown in a SSH session.
I tried unset DISPLAY but it did not help. The GPG command line ...
- 7,853
80
votes
20
answers
61k
views
Sharing the same `ssh-agent` among multiple login sessions
Is there a convenient way to ensure that all logins from a given user (ie me) use the same ssh-agent? I hacked out a script to make this work most of the time, but I suspected all along that there ...
- 3,391
56
votes
5
answers
57k
views
Rsync files via intermediate host
I am currently away from my LAN and I need to do a backup of my laptop. I have a somewhat recent copy of my laptop on my server and I usually back the laptop up using rsync. Now I wish to do that, but ...
- 811
45
votes
5
answers
54k
views
SSH access to office host behind NAT router
I would like to access the ssh port of my office linux host from home. Unfortunately the host is located behind a NAT router. So, the IP address is not publicly available. There is however access to ...
- 735
24
votes
1
answer
10k
views
Using the IdentityFile directive in ssh_config when AgentForwarding is in use
Is it possible to specify forwarded keys using the IdentityFile directive in .ssh/config?
I ran into this quirk when trying to deploy some code via Capistrano/GIT on our production server. Both my ...
- 385
19
votes
6
answers
53k
views
Command to copy client public key to Windows OpenSSH SFTP/SSH server authorized keys file
I have a Linux machine, and I need to sftp to a Windows SFTP server. So for first step, I create my own id_rsa file and the id_rsa.pub in my Linux machine.
Then I copy the text in the id_rsa.pub into ...
- 291
18
votes
1
answer
23k
views
How to check if your ssh keys are in the ssh-rsa2 format?
So recently there were news of OpenSSH dropping support for SHA-1 logins and I am trying to understand which format they are referring to. Since years i've been generating keys via ssh-keygen -t rsa -...
- 291
15
votes
8
answers
23k
views
Windows SSH Servers?
I was wondering what people use as an SSHd server on Windows? I've decided that I want to be able to log in using SSH on my Windows computers but I don't want to use Linux full-time. What are my ...
- 803
14
votes
3
answers
26k
views
Logging into Windows 10 OpenSSH server with Administrator account and public key
I am unable to log into a Windows 10 OpenSSH Server from a CentOS OpenSSH client via public key. My password is always requested (and is accepted).
I've found many posts about setting the permissions ...
- 1,029
4
votes
1
answer
36k
views
How to type commands in PuTTY by creating batch file?
I have created a .bat file which automatically takes the SSH server (Jump Server) access. Now, I have couple of commands which I would like to hit in that window.
For an ex. (To take root access)
...
- 69
4
votes
2
answers
3k
views
Does OpenSSH support multihop login?
Ansible uses OpenSSH as the bottomed network communicative implementation, but does it support multi-hop login?
I mean, if Ansible can login a server directly, but can it log in server_a then from ...
- 880
4
votes
1
answer
1k
views
Remote code execution after tmux reboot
I've read about tmux-resurrect, but it's still not clear to me if I can do the following:
start tmux session
ssh to remote server
launch long-running code on remote host
kill tmux server (e.g. local ...
- 143