1. Ssh Config Identity File
2. No Ssh Config File Extension
3. No Sshd_config File In Ubuntu
4. Ssh Without Config File

The /etc/ssh/sshd_config file is the system-wide configuration file for OpenSSH which allows you to set options that modify the operation of the daemon. This file contains keyword-value pairs, one per line, with keywords being case insensitive. Here are the most important keywords to configure your sshd for top security; a complete listing and/or special requirements are available in the man page for sshd(8).

Edit the sshd_config file, vi /etc/ssh/sshd_config and add/or change, if necessary, the following parameters:

This tells sshd_config file to set itself up for this particular configuration setup with:

The first step toward creating a working SVL Injector config file is creating an SSH account. Ssh/config fatal: The remote end hung up unexpectedly. Ssh/config' Size: 47 Blocks: 1 IO Block: 65536 regular file Device: 4ade2efdh/d Inode.

The option Port specifies on which port number ssh daemon listens for incoming connections. The default port is 22.

The option ListenAddress specifies the IP address of the interface network on which the ssh daemon server socket is bind. The default is 0.0.0.0; to improve security you may specify only the required ones to limit possible addresses.

The option HostKey specifies the location containing the private host key.

The option ServerKeyBits specifies how many bits to use in the server key. These bits are used when the daemon starts to generate its RSA key.

The option LoginGraceTime specifies how long in seconds after a connection request the server will wait before disconnecting if the user has not successfully logged in.

The option KeyRegenerationInterval specifies how long in seconds the server should wait before automatically regenerated its key. This is a security feature to prevent decrypting captured sessions.

The option PermitRootLogin specifies whether root can log in using ssh. Never say yes to this option.

The option IgnoreRhosts specifies whether rhosts or shosts files should not be used in authentication. For security reasons it is recommended to no use rhosts or shosts files for authentication.

The option IgnoreUserKnownHosts specifies whether the ssh daemon should ignore the user's $HOME/.ssh/known_hosts during RhostsRSAAuthentication.

The option StrictModes specifies whether ssh should check user's permissions in their home directory and rhosts files before accepting login. This option must always be set to yes because sometimes users may accidentally leave their directory or files world-writable.

The option X11Forwarding specifies whether X11 forwarding should be enabled or not on this server. Since we setup a server without GUI installed on it, we can safely turn this option off.

The option PrintMotd specifies whether the ssh daemon should print the contents of the /etc/motd file when a user logs in interactively. The /etc/motd file is also known as the message of the day.

The option SyslogFacility specifies the facility code used when logging messages from sshd. The facility specifies the subsystem that produced the message--in our case, AUTH.

The option LogLevel specifies the level that is used when logging messages from sshd. INFO is a good choice. See the man page for sshd for more information on other possibilities.

The option RhostsAuthentication specifies whether sshd can try to use rhosts based authentication. Because rhosts authentication is insecure you shouldn't use this option.

The option RhostsRSAAuthentication specifies whether to try rhosts authentication in concert with RSA host authentication.

The option RSAAuthentication specifies whether to try RSA authentication. This option must be set to yes for better security in your sessions. RSA use public and private key pairs created with the ssh-keygen1utility for authentication purposes.

The option PasswordAuthentication specifies whether we should use password-based authentication. For strong security, this option must always be set to yes.

The option PermitEmptyPasswords specifies whether the server allows logging in to accounts with a null password. If you intend to use the scp utility to make automatic backups over the network, you must set this option to yes.

The option AllowUsers specifies and controls which users can access ssh services. Multiple users can be specified, separated by spaces.

Overview

By creating a local configuration file for SSH, you can create shortcuts for servers you frequently access, in addition to configuring more advanced options. This article will demonstrate how to create a shortcut to your DV server, including how to keep your connection active.

Ssh Config Identity File

Requirements

This article has the following dependencies:

• Please make sure you have a basic understanding of SSH and have configured access for the root user or a domain user. See Connecting via SSH to your server for assistance.
• example.com is used as an example. Please be sure to replace this text with the proper information for your site or server.
• This article assumes that you are using a Unix operating system, such as Mac OS X or Ubuntu. We will use OS X as our example. Please modify as needed for your environment.

READ ME FIRST

This article is provided as a courtesy. Installing, configuring, and troubleshooting third-party applications is outside the scope of support provided by (mt) Media Temple. Please take a moment to review the Statement of Support.

Instructions

1. Launch the terminal application on your local computer and create your config file in your home directory:

TIP:

On OS X, this is located at /Applications/Utilities/Terminal.app. Consider dragging this application into your Dock for convenience.

NOTE:

Your .ssh directory is automatically created when you use the ssh command for the first time. If you have never used ssh before under this user account please create the directory first using:

2. Edit the file using vi or any Unix text editor you are comfortable with. We will use vi:

3. There are many options for your config file. Below is an example entry for a shortcut to your DV server:

4. Now that you have your shortcut created, you can add even more options directly below these entries. For instance, maybe you want to make sure your session 'stays alive' while you step away from your keyboard for a bit. The following example will refresh your connection every 30 seconds for a maximum of one hour:

No Ssh Config File Extension

5. Perhaps you have both a Grid and a DV service with us. Here is an example file showing multiple hosts:

No Sshd_config File In Ubuntu

Resources

Ssh Without Config File

• Running the command 'man ssh_config' in a Terminal will show you detailed usage information.
• http://www.openssh.com/manual.html OpenSSH homepage, including a section on ssh_config