$ sudo dnf install openssh-server Next step is to enable systemd service sshd to make sure that SSH daemon will start after the reboot: $ sudo systemctl enable sshd Once the SSHD service is enable use once again the systemclt command to start SSH server: $ sudo systemctl start sshd Once ready check the SSH server status using the following command. On Debian, the default behavior of OpenSSH server is that it will start automatically as soon as it is installed. You can also check whether OpenSSH server is running on it with the following command: $ sudo systemctl status ssh. You should see ‘active (running)’ status as shown in the screenshot below. Some server providers, such as Amazon EC2 and Google Compute Engine, disable SSH password authentication by default. That is, you can only log in over SSH using public key authentication. This quick tip shows Ubuntu beginners how to enable the secure shell (SSH) service in Ubuntu 19.10. SSH, also known as Secure Shell or Secure Socket Shell, is a network protocol or operating.
In this tutorial we are going to learn how to install and configure SSH Server on Ubuntu Server/Desktop Operating System. The Secure Shell (SSH) is the most common and secure way to manage Ubuntu using a command line from a remote location.
For this tutorial I am using Ubuntu 18.04 LTS, But you can use the following guide to setup SSH Server on any previous Ubuntu version.
Install OpenSSH Server on Ubuntu 18.04
The SSH Server for Ubuntu is provided by the openssh-server package. If not already installed, you can install openssh-server package in Ubuntu 18.04, using the apt-get install command.
To install OpenSSH, open the Ubuntu terminal and execute:
This will install the SSH Server on our Ubuntu System.
Start SSH Server on Ubuntu
OpenSSH Server should start automatically after the installation, if not, to start the SSH Server on Ubuntu 18.04, we use the systemctl command.
In Ubuntu 14.04 use service command to start the ssh service.
Enable SSH root login in Ubuntu
By default SSH Server in Ubuntu do not allow to connect to the server using the root username. In order to allow root SSH Login we need to change PermitRootLogin to yes in the /etc/ssh/sshd_config file.
First, Open the /etc/ssh/sshd_config file.
Then locate the line PermitRootLogin directive, uncomment (remove the # in front) and change its value to yes.
Then, Save the SSH Configuration file and restart the SSH Server.
Or
Now you can login to the Ubuntu SSH Server using the root user Account.
Summary - Setup SSH Server on Ubuntu
In this tutorial we learned how to install SSH Server on Ubuntu Linux.
- SSH Server for Ubuntu provides by the openssh-server package. OpenSSH is the most widely deployed SSH server in the world
- By default Root Login to the SSH Server is disabled in Ubuntu Linux.
- To enable Ubuntu root SSH login, we need to set PermitRootLogin yes in the /etc/ssh/sshd_config file.
This topic covers the Windows-specific configuration for OpenSSH Server (sshd).
OpenSSH maintains detailed documentation for configuration options online at OpenSSH.com, which is not duplicated in this documentation set.
Configuring the default shell for OpenSSH in Windows
The default command shell provides the experience a user sees when connecting to the server using SSH.The initial default Windows is the Windows Command shell (cmd.exe).Windows also includes PowerShell and Bash, and third party command shells are also available for Windows and may be configured as the default shell for a server.
To set the default command shell, first confirm that the OpenSSH installation folder is on the system path.For Windows, the default installation folder is SystemDrive:WindowsDirectorySystem32openssh.The following commands shows the current path setting, and add the default OpenSSH installation folder to it.
| Command shell | Command to use |
|---|---|
| Command | path |
| PowerShell | $env:path |
Enable Ssh Service Linux
Configuring the default ssh shell is done in the Windows registry by adding the full path to the shell executable to ComputerHKEY_LOCAL_MACHINESOFTWAREOpenSSH in the string value DefaultShell.
Enable Ssh Service In Windows
As an example, the following Powershell command sets the default shell to be PowerShell.exe:
Windows Configurations in sshd_config
In Windows, sshd reads configuration data from %programdata%sshsshd_config by default, or a different configuration file may be specified by launching sshd.exe with the -f parameter.If the file is absent, sshd generates one with the default configuration when the service is started.
The elements listed below provide Windows-specific configuration possible through entries in sshd_config.There are other configuration settings possible in that are not listed here, as they are covered in detail in the online Win32 OpenSSH documentation.
AllowGroups, AllowUsers, DenyGroups, DenyUsers
Controlling which users and groups can connect to the server is done using the AllowGroups, AllowUsers, DenyGroups and DenyUsers directives.The allow/deny directives are processed in the following order: DenyUsers, AllowUsers, DenyGroups, and finally AllowGroups.All account names must be specified in lower case.See PATTERNS in ssh_config for more information on patterns for wildcards.
When configuring user/group based rules with a domain user or group, use the following format: user?domain*.Windows allows multiple of formats for specifying domain principals, but many conflict with standard Linux patterns.For that reason, * is added to cover FQDNs.Also, this approach uses '?', instead of @, to avoid conflicts with the username@host format.
Work group users/groups and internet-connected accounts are always resolved to their local account name (no domain part, similar to standard Unix names).Domain users and groups are strictly resolved to NameSamCompatible format - domain_short_nameuser_name.All user/group based configuration rules need to adhere to this format.
Examples for domain users and groups
Examples for local users and groups
AuthenticationMethods
For Windows OpenSSH, the only available authentication methods are 'password' and 'publickey'.
AuthorizedKeysFile
The default is '.ssh/authorized_keys .ssh/authorized_keys2'. If the path is not absolute, it is taken relative to user's home directory (or profile image path). Ex. c:usersuser. Note that if the user belongs to the administrator group, %programdata%/ssh/administrators_authorized_keys is used instead.
ChrootDirectory (Support added in v7.7.0.0)
This directive is only supported with sftp sessions. A remote session into cmd.exe wouldn't honor this. To setup a sftp-only chroot server, set ForceCommand to internal-sftp. You may also set up scp with chroot, by implementing a custom shell that would only allow scp and sftp.
HostKey
The defaults are %programdata%/ssh/ssh_host_ecdsa_key, %programdata%/ssh/ssh_host_ed25519_key, %programdata%/ssh/ssh_host_dsa_key, and %programdata%/ssh/ssh_host_rsa_key. If the defaults are not present, sshd automatically generates these on a service start.
Match
Note that pattern rules in this section. User and group names should be in lower case.
PermitRootLogin
Not applicable in Windows. To prevent administrator login, use Administrators with DenyGroups directive.
SyslogFacility
If you need file based logging, use LOCAL0. Logs are generated under %programdata%sshlogs.For any other value, including the default value, AUTH directs logging to ETW. For more info, see Logging Facilities in Windows.
Not supported
The following configuration options are not available in the OpenSSH version that ships in Windows Server 2019 and Windows 10 1809:
- AcceptEnv
- AllowStreamLocalForwarding
- AuthorizedKeysCommand
- AuthorizedKeysCommandUser
- AuthorizedPrincipalsCommand
- AuthorizedPrincipalsCommandUser
- Compression
- ExposeAuthInfo
- GSSAPIAuthentication
- GSSAPICleanupCredentials
- GSSAPIStrictAcceptorCheck
- HostbasedAcceptedKeyTypes
- HostbasedAuthentication
- HostbasedUsesNameFromPacketOnly
- IgnoreRhosts
- IgnoreUserKnownHosts
- KbdInteractiveAuthentication
- KerberosAuthentication
- KerberosGetAFSToken
- KerberosOrLocalPasswd
- KerberosTicketCleanup
- PermitTunnel
- PermitUserEnvironment
- PermitUserRC
- PidFile
- PrintLastLog
- RDomain
- StreamLocalBindMask
- StreamLocalBindUnlink
- StrictModes
- X11DisplayOffset
- X11Forwarding
- X11UseLocalhost
- XAuthLocation