Sudo Service Sshd Restart



In Ubuntu, install sshd client and server with these commands: sudo apt-get install openssh-client. Sudo apt-get install openssh-server Then, to restart sshd, type: sudo /etc/init.d/ssh restart This worked for me, when I had the same problem. You can find more information here. Sudo stop ssh sudo start ssh As it leverages upstart, this is The Best Way™ to do it, rather than using /etc/init.d/ssh, service, or invoking sshd directly. Make sure to run both commands; if you get an error on stop ssh, start ssh anyway and see what it says—the service could already be stopped. For systemd system, the service files are available on /usr/lib/systemd/system/ directory. If you would like to perform any kind of actions like start, stop, restart, enable, reload & status against the specific service then use the following commands. Make sure that you should have admin privileges to run these commands except status command. Sudo service sshd restart. Restart SSH For OpenBSD /etc/rc.d/sshd restart. Doas /etc/rc.d/sshd restart. Share on facebook. Share on twitter. Share on linkedin. Share on telegram. Share on whatsapp. Add Extra IP addresses to server configuration On Ubuntu 17.10 and later. Restart SSH service using System V. $ sudo /etc/init.d/ssh restart Restarting ssh (via systemctl): ssh.service. View SSH status using systemd.

I am a new Linux/Unix server admin. How do I change the SSH Port for my Linux or Unix server using command line option?
You can easily change the SSH Port for Your Linux or Unix server. The ssh port defined in sshd_config file. This file located in /etc/ssh/sshd_config location.

Procedure to change the SSH Port for Linux or Unix Server

  1. Open the terminal application and connect to your server via SSH.
  2. Locate sshd_config file by typing the find command.
  3. Edit the sshd server file and set Port option.
  4. Save and close the file
  5. Restart the sshd service to change the ssh port in Linux.

Locate sshd_config file by typing the following command

$ find / -name 'sshd_config' 2>/dev/null
Sample outputs:

The find command try to locate sshd server config file named sshd_config. I added the 2&gt/dev/null at the end to hide find command permission denied messages warning/spam.

Edit the file and set Port option

Type the following command:
$ sudo vi /etc/ssh/sshd_config
Locate line that read as follows:
Port 22
OR
#Port 22
To set the port to 2222, enter:
Port 2222
Save and close the file. Please note that port numbers 0-1023 are reserved for various system services. Hence, I recommend choosing port numbers between 1024 and 65535. Here is a common list of privileged services and designated as well-known ports:

Use the cat command/grep command/egrep command to see internet network services list:
cat /etc/services
less /etc/services
more /etc/services
grep -w '22/tcp' /etc/services
grep SSH /etc/services
grep -w '80/tcp' /etc/services
egrep -w '(80|443|110|53)/tcp' /etc/services

A note about SELinux users

Systemd restart sshd

You must type the following command to change port to 2222:
# semanage port -a -t ssh_port_t -p tcp 2222

Updating your firewall to accept the ssh port 2222 in Linux

If you are using UFW on a Ubuntu/Debian Linux, type:
$ sudo ufw allow 2222/tcp
The syntax for iptables is as follows
$ sudo /sbin/iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 2222 -j ACCEPT
The syntax for pf firewall is as follows (FreeBSD/OpenBSD/NetBSD Unix) in your pf.conf:
pass log on $ext_if proto tcp to any port 2222 keep state
To open the new port run the following commands on Fedora/CentOS/RHEL/Oracle Linux using FirewallD
$ sudo firewall-cmd --permanent --zone=public --add-port=2222/tcp
$ sudo firewall-cmd --reload

Warning: You must update your firewall settings to accept new port. Otherwise the following command will lock down your ssh access.

Restart the sshd service

Type the following command on a CentOS/RHEL/Fedora Linux:
$ sudo service sshd restart
OR if you are using CentOS/RHEL/Fedora Linux with systemd:
$ sudo systemctl restart sshd
OR if you are using Ubuntu/Debian/Mint Linux:
$ sudo service ssh restart
OR if you are using Ubuntu/Debian/Mint Linux with systemd:
$ sudo systemctl restart ssh
Or if you are using FreeBSD Unix, enter:
$ sudo service sshd restart

Sudo service ssh restart ubuntu

Ubuntu Restart Sshd Service

How to verify that TCP port 2222 opened

Use the netstat command or ss command:
ss -tulpn | grep 2222
netstat -tulpn | grep 2222

How to use the new SSH port with command line

The syntax is:
ssh -p {port} user@server
sftp -P {port} openssh-server
scp -P {port} source target
scp -P {port} /path/to/foo user@server:/dest/
For example:
ssh -p 2222 vivek@server1.cyberciti.biz

Conclusion

Sudo Systemctl Restart Sshd.service

Sudo Service Sshd Restart

Restart Sshd Unix

This page explained how to change the SSH port on both Linux and Unix-like systems including ssh command line option for connecting the server. For further information please see the following resources: