Mar 18, 2020 An SSH client allows you to connect to a remote computer running an SSH server. The Secure Shell (SSH) protocol is often used for remote terminal connections, allowing you to access a text-mode terminal on a remote computer as if you were sitting of it. It can also be used for SSH tunneling, SCP file transfers, and other things.

This document will help you connect to make real remote connection to your Mac server using SSH protocol.

SSH (“secure shell”) is an application-level network protocol designed for secure remote access to UNIX systems.

How to Activate SSH Connection in macOS

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Follow the instructions in this article to enable remote control of SSH for macOS server:

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• Open the “System Preferences”;

• Choose “Sharing”;

• In the left column of the service, enable the “Remote Login” option.

Firewall

If the firewall is enabled (by default), you may need to restart the firewall to allow SSH passing through port 22:

• Open the “System Preferences” -> “Security and Privacy”;

• Restart the Firewall;

• Unlock Access with “Lock” icon;
• Turn it “Off” and put it “On” again;

• If you cannot log in, restart the firewall or restart the computer.

Read more: How to use SSH on a Mac?

Connect to SSH Server

UNIX-based operating systems, such as macOS and Linux, include a built-in SSH command that works almost the same everywhere. We need to know the IP address of the SSH server and the password for the user or root.

To connect to an SSH server, open a terminal window on a Mac:

• Open “Terminal”;

• To connect to the SSH server, enter the following command in the terminal, replacing the username on your’s SSH server login and use the hostname or IP address of the server to which you are connecting:

• A message will appear on the screen to confirm your identity, you must enter a password and the system will greet you and inform you of a successful login.

Conclusion

SSH is effective in that it encrypts all information transmitted over the network, in contrast to the telnet protocol. Basically, it is needed to remotely manage user data on the server, run service commands, work in console mode with databases. This does not end the possibilities of this tool.

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1. Why Use Port Forwarding?

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The first two articles in this series looked at what Virtual Private Networks (VPN) technologies are available for Mac OS X and Mac OS X Server. Part 1 talked about how to configure Mac OS X computers to connect to remote networks using VPN. In part 2, we talked about how to configure the VPN service in Mac OS X Server. In this final piece, we look at how to use SSH’s port forwarding feature (also called port tunnelling) to achieve some of the benefits of VPN access without the need for a VPN server.

SSH (secure shell) is a technology for securely connecting to a remote computer. As you might suspect from shell being in the name of the technology, SSH is primarily intended to allow shell login and command-line access to remote Unix or Linux computers (though SSH clients exist for Windows as well). This allows for administration and use of the remote computer as if you were entering commands from a keyboard attached to it. SSH uses encryption technology to establish secure connections between the two computers, which enables it to be far more secure than previous remote command-line features such as telnet.

The SSH protocol includes a number of other features besides basic login. One of them is port forwarding, which forwarding enables you to establish an SSH connection to a remote computer and then to forward specific types TCP/IP network traffic to that secure connection instead of to your computer’s network port, based on the port numbers associated with protocols used for that type of traffic. The result is that when you make requests for specific types of network resources, such as file sharing, your computer will forward those requests through the SSH connection instead of attempting to locate the resources on the local network to which your computer is connected.

Why Use Port Forwarding?

Port forwarding provides two main uses. First, it enables you to establish secure tunnels between two computers (much like VPN). You can securely connect to another computer through the Internet to securely transfer data that you might otherwise not be able to do. Any Internet or network protocol can be forwarded, including things like file sharing, web browsing, email, and remote management tools (such as Mac OS X Server’s Server Admin or the multiplatform VNC).

Second, you can use port forwarding as a way to allow secure access through a firewall. When you implement a firewall, one of the primary ways it secures your network or computer is by limiting what types of traffic can pass into the network. For every type of network or Internet protocol you allow, you need to open ports on the firewall. Each newly opened port exposes your network or computer to more potential security risks. This can be especially dangerous when you start opening ports used for remote management protocols such as Apple Remote Desktop, VNC, or the Mac OS X Server management tools. Port forwarding mitigates these risks because you need to open only a single port that SSH will use to forward all the other traffic through. You even get to choose the port that SSH uses, meaning that you can choose a port that is traditionally unused for network or Internet traffic.

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VPN provides much of the same functionality by encrypting data and transmitting it through set ports the same way. However, implementing a VPN server can be expensive and require some amount of effort. There can be many situations in which you only want to establish a secure connection to transfer a handful or files, manage a remote server or workstation, or perform some other task very infrequently. A great example is when you’re at work and need access to a file from home (a situation opposite of the ones in which VPN is typically used), or if you want to control a friend’s computer securely using VNC to help them work on a project or resolve a problem.

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