67
votes
Accepted
Start SSH automatically on boot
Have you tried just simply setting
sudo systemctl enable ssh
?
That's how I have my ssh set to run at start up.
****I'm leaving in the above part of the answer in case it's helpful for others who ...
- 1,016
54
votes
How to setup a restricted SFTP server on Ubuntu?
Step 1 : Install OpenSSH package if not installed
sudo apt-get install openssh-server
Step 2 : Create separate group for SFTP users.
sudo addgroup ftpaccess
Step 3 : Edit /etc/ssh/sshd_config ...
- 541
54
votes
Error `could not load host key` when trying to recreate SSH host keys
None of the answers above worked for me. I fixed my ubuntu system by doing the following:
/usr/bin/ssh-keygen -A
- 641
41
votes
Accepted
What's the difference between ssh and openssh packages?
Ok... Simple: Let's ask the package manager aptitude search ssh. You will get a rather large output, but I'll pick a few for you:
i A openssh-client - secure shell (SSH) client, ...
- 2,472
35
votes
Accepted
key_load_public: invalid format with scp or git clone on Ubuntu 15.10
Check the file /Users/alexzeitler/.ssh/id_rsa. What is there? How did it get there?
It should be your private RSA key, isn't it? And is there something in /Users/alexzeitler/.ssh/id_rsa.pub? Is it ...
- 6,435
34
votes
Accepted
Key based SSH login that requires both key AND password
There are two ways to configure ssh to require both a public key and a password or passphrase.
The difference between the password and the passphrase:
The password in this context is the password ...
- 29.7k
32
votes
Accepted
How do I setup SSH key based authentication for GitHub by using ~/.ssh/config file?
Here is а short manual how to setup SSH key based authentication for GitHub.
1. Install the openssh-client if it is not already installed, and of course git:
sudo apt update && sudo apt ...
- 28.8k
31
votes
How can I reconnect to a ssh session after a broken pipe?
While you can't reattach to a broken SSH session, you can reparent the process running inside SSH – functionally equivalent to what you want.
Instructions
In your case, you would take over the apt-get ...
- 5,881
31
votes
ssh: automatically accept keys
I'm a bit late with this response, but the sensible way would be to do a ssh-keyscan on the new machine before you run the uptime gathering.
ssh-keyscan <newhost> >> ~/.ssh/known_hosts
...
- 467
27
votes
How can I access my Ubuntu phone over ssh?
With the official final release Ubuntu for Phones ships the "android-gadget-service" tool with which you can manage adb, mtp, USB tethering and ssh.
Connect your device via USB, enable Developer Mode ...
- 412
27
votes
Accepted
Where is the .ssh directory?
The file is not created by the installation, but upon the first use of ssh or ssh-keygen. If it is not there, there is nothing to worry about. You can simply create it using mkdir ~/.ssh/.
- 6,435
24
votes
Accepted
Enabling and disabling sshd at boot via systemd
sshd service is originally written as ssh.service and sshd.service is set as alias name. Check out the last line of following output.
arryph@localhost:~$ systemctl cat sshd.service
# /lib/systemd/...
- 609
23
votes
Accepted
apt-get dependency issue Open-SSH Client
Just remove these packages to let you use apt for other packages.
Execute this commands in terminal.
sudo apt-get remove openssh-server openssh-client --purge && sudo apt-get autoremove &&...
- 4,421
22
votes
How to disable autostart of SSHD in Ubuntu 15.04
The command
systemctl disable ssh
did it for me.
@Jakuje: Thanks for giving me the idea.
- 481
21
votes
How to solve 'Connection refused' errors in SSH connection?
open the file of ssh config:
sudo nano /etc/ssh/ssh_config
find the port
#port 22
uncomment (remove the #) the port option
then save the file by ctrl + x and restart your service
sudo service sshd ...
- 341
21
votes
Accepted
How to generate Openssl .pem file and where we have to place it
First you need to upload public key to the server you are willing to connect to, public key is in .pub file:
Example:
# ssh-copy-id -i ~/my-certificate.pub root@12.34.56.78
After this it should be ...
- 5,391
20
votes
How can I access my Ubuntu phone over ssh?
To activate ssh access entirely over wifi, without developer mode on the phone, without any special tooling on your computer and without using USB:
If you don't already have an ssh keypair, type ssh-...
- 15.3k
20
votes
Accepted
What is the difference between PGP and RSA protocols?
Using a car analogy:
PGP is a car
OpenPGP is the design for the PGP car
GnuPG is another car using the same design
RSA is a diesel engine, and other engines are available
SSH isn't a car at all. But ...
- 188k
18
votes
What does 'without password' mean in sshd_config file?
Actually this setting does pretty much nothing if you are using PAM authentication. At the bottom of the sshd_config configuration file you will find:
# Set this to 'yes' to enable PAM authentication,...
- 572
18
votes
Is possible to upgrade openssh-server OpenSSH_7.6p1, to OpenSSH_8.0p1?
To upgrade OpenSSH from 7.6 to 8.9 on Ubuntu 18.04 (bionic), I followed the instructions given here: How to Install OpenSSH 8.0 Server from Source in Linux.
The version I started with:
$ ssh -V
...
- 281
17
votes
Accepted
Difference between Software Selection Servers
The term "server" means a piece of software that offers a service to clients. A server usually waits for a client to contact it, and then sends the reply to the client. For further ...
- 13.9k
16
votes
How to enable SSH on boot in Ubuntu MATE
I think the command you're looking for is:
sudo systemctl enable ssh
(Note the letter "l" at the end of systemctl, rather than the number "1" at the end of systemct1 as you currently have it in the ...
- 1,423
15
votes
libcrypto.so.1.0.0: no version information available (required by ssh)
Have you installed a non-Ubuntu version of OpenSSL from somewhere?
The Ubuntu version of OpenSSL has some additional patches installed that are not included if you get your version of OpenSSL from ...
- 2,100
14
votes
Accepted
ssh: connect to host 10.0.2.15 port 22: Connection refused
Use ssh with port option:
ssh root@10.0.2.15 -p 2222
Edit
This issue happens when you change your ssh server port to a non standard port like 2222 in ssh config file. (/etc/ssh/sshd_config --> ...
- 1,775
13
votes
Accepted
SSH Server cannot be found - Even though installed
It is possible that the service is not called sshd.
you can try this command
systemctl -l --type service --all|grep ssh
On my ubuntu 18.04, the service is called ssh by default.
in my case, I did
...
- 368
12
votes
SSH error: Permission denied, please try again
This is not exact answer for this question. But In my case, there was redundant lines. (there were same line twice)
PermitRootLogin yes
and also
AllowUsers otheruser
You should add 'root' user to ...
- 221
12
votes
Accepted
Limit SFTP user access to specified directory
Settings for /etc/ssh/sshd_config
Subsystem sftp internal-sftp -f AUTH -l VERBOSE
UsePAM yes
Match group sftp
ChrootDirectory %h
ForceCommand internal-sftp
AllowTcpForwarding no
create group ...
- 10.2k
11
votes
Accepted
Why do I've two entries per server in known_hosts file?
You have two entries because one is by domain and the other by IP address, so your example:
|1|wwwwwwwwwwwwwww=|wwwwwwwwww= ecdsa-sha2-nistp256 AAAAAAAAAA+AAAAA=
|1|vvvvvvvvvvvvvvv=|vvvvvvvvvv= ecdsa-...
- 136
11
votes
Accepted
Error `could not load host key` when trying to recreate SSH host keys
sudo ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N 'myverylongpasswordhere' -b 4096 -t rsa
recreates me the keys. but, after restarting the server, i recieve
could not load host key: /etc/ssh/...
- 28.2k
10
votes
Accepted
Not able to change ssh port on Ubuntu 18.04.1 LTS
The file that you edited, /etc/ssh/ssh_config is the global ssh client configuration file - changing the port there will change the port which the ssh (and scp) programs try to connect to.
To change ...
- 127k
Only top scored, non community-wiki answers of a minimum length are eligible