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Use the ssh-keygen command to generate SSH public and private key files. By default, these files are created in the ~/.ssh directory. You can specify a different location, and an optional password (passphrase) to access the private key file. If an SSH key pair with the same name exists in the given location, those files are overwritten.

If you're connecting to this VM for the first time, you'll be asked to verify the host's fingerprint. It's tempting to accept the fingerprint that's presented, but that approach exposes you to a possible person-in-the-middle attack. You should always validate the host's fingerprint. You need to do this only the first time you connect from a client. To obtain the host fingerprint via the portal, use the Run Command feature to execute the command ssh-keygen -lf /etc/ssh/ssh_host_ecdsa_key.pub | awk '{print $2}'.

I used SSH to remotely connect to thousands of customer machines during my time as a support engineer, and I am sure that others have had a similar experience. With traditional SSH authentication, you need the username and password for the account you want to log in to every time that you wish to access a system. Doesn't sound that bad, right? But, what happens when you need to jump back and forth between systems regularly? Or what if your responsibilities include remote sessions to the same 100 systems throughout the day for health checks? There is another way to accomplish the log in, and with a little upfront investment, it can be far more efficient overall.

The second creates the session specified by session URL and optionally by initial remote path. If the remote path is not ended by slash (/), it is treated as path to file (or even directory) that should be downloaded.

A parameter after the /keygen switch specifies a path to an input private key file. The input key can be in OpenSSH or ssh.com format (when converting the key to the PuTTY format) or in the PuTTY format (when changing a key passphrase or comment).

For a compatibility with *nix puttygen, the -o, -P and -C switches are understood as aliases to /output, /changepassphrase and /comment respectively. So, for features supported by WinSCP, you can use the same arguments as for puttygen, just prefixed with /keygen:

I have been trying to download Xcode 13.1 on the new 16" MacBook pro-2021, with iOS Monterey and it keeps getting stuck at the very end. I have tried restarting and redownloading it on my computer, but it keeps getting stuck. Is anyone else having this issue? There should be no reason that Xcode won't run on the new M1 Pro chips, so I am wondering if it is an issue with iOS Monterey.

Looks like it's downloading VERY slowly and the progress within the App Store application doesn't match the progress of the Xcode.app progress wheel in from Finder in the Applications folder. It's been downloading/updating for 6 hours...almost done.

So this has become absurd. I have a 2016 MacBook Pro and a 2014 Mac mini that have been downloading and "installing" Xcode now for 3 days. They all get stuck during the final install. For days. I can't even stop it and delete it. I have tried safe mode, rebooting, deleting the app from the application folder, and nothing works. Both machines are slowed to a crawl. About about ready to wipe the MacBook Pro and reinstall Monterey but I'd like to avoid that.

have run into the very same issue... MBP 13inch 2020 with M1 and 12.2 freshly installed. First Xcode didn't get installed at all off the App Store but with the downloaded xip it worked - however uploading to App Store Connect never finishes. I've also tried to only export and upload via Transporter. Interestingly enough this works but results in "Invalid Binary" errors in TestFlight. This whole mess renders my complete dev workflow effin useless.... ?

UPDATE: after going through this whole process, if you want to redownload Xcode from the App Store (I did try it) you can, and the spinning wheel was there again. But this time it resolved after a few minutes and the application was successfully installed. But I purposely tried to keep the laptop awake the whole time. I think if your laptop goes to sleep in the middle of this process, it causes the installer to bug and spin indefinitely.

Use ssh-keygen or similar to get and configure a public/private key pair for SSH authentication. Password authentication is not supported by Docker and not possible with a DOCKER_HOST-based configuration. If a key pair has already been set up, it can be used.

There is an issue with ssh-keygen utility that comes with Windows 10 build 1909 and older that prevents it from working properly with newer SSH daemons (for example, the one that comes with Ubuntu 20.04 LTS and newer). The workaround is to use ECDSA-type key, not RSA-type key, for the SSH connection. You can generate an ECDSA SSH key and add it to SSH agent with following commands:

In Windows, you can connect to Linux VPC instances using PuTTY. To get SSH agent functionality, you can use Pageant, which is available from the PuTTY download page. When Pageant is installed, you can use the agent forwarding option in PuTTY to connect to instances in private subnets.

To use Pageant, you need to convert your private key from PEM format to PuTTY format using PuTTYGen (available from the PuTTY download page). In PuTTYGen, choose Conversions > Import Key and select your PEM-formatted private key. Enter a passphrase and then click Save private key, as shown in the following screenshot. Save the key as a .ppk file.

I am trying to create on cluster in which i am trying to send multiple configuration file. I have installed four Redhat OS in VMWARE which is connected through IP. when i run script at host server with ssh-keygen, it always ask me for password. To resolved it i have also used sshpass and passing password from one temp file but same issue. each time it ask for password. I have follow all three steps of SSH-KEYGEN. Could you please help me, where could be a mistake.

There are many reasons for using a jump host. One reason is to have a single point of entry to your network, thereby reducing the size of any potential attack surface. Another reason is that it makes it easier to have an aggregated audit log of all entry connections to a network. The jump host can provide improved security and accountability by consolidating user activities through a single entry point.

A jump host that is compromised is a huge risk to the infrastructure of a network. If a bad actor breaches the jump host, they gain access to every other part of the network accessible from the jump host with relative ease. This can include private user data and trade secrets.

The Secure Shell protocol (SSH) is a network protocol that allows two computers to communicate securely over an unsecured network. The most commonly implemented software stack for the SSH protocol is OpenSSH, which comes bundled with most Linux distributions. SSH is widely used by system administrators to manage applications remotely, send files, and log in to another computer over a network. A jump host can be used to enable remote SSH access to internal servers.

There are many ways to secure SSH connections. At the most basic level, usernames and passwords can be used, but a more common and secure option is to use SSH keys to authenticate the client with the server. SSH keys need to be generated and distributed between the clients, servers, and jump hosts that will use them. To learn more, see guides such as this one.

SSH key-based authentication lets users authenticate to SSH servers without needing to use a password. It uses a cryptographic key pair to authenticate with the remote server. To set this up, start by generating an SSH key pair on your laptop with the ssh-keygen command:

In this example, the jump server and destination server are specified in a single command using the -J option. The -J option connects to the jump host, user@jump_gateway, by making an SSH connection, then forwards a connection to the destination server, user@destination:

To jump from the originating client to the destination IP through a jump IP, issue the command ssh host_dest. This will establish a connection to jump_gateway, which will then forward it to the destination host, host_dest.

In the context of implementing access to servers using an RDP jump host, the Remote Desktop Gateway (RD Gateway) can be used to set up secure remote access to a server using RDP. The Remote Desktop Gateway is a server that filters RDP connections from external resources. It uses RDP to allow access to network resources by boosting security through encrypted HTTPS connections, effectively acting as a jump host.

By restricting access to the SSH server to users who have logged in to Tailscale, the need for a jump host is removed. Additionally, Tailscale allows you to force two-factor authentication, which is a stronger protection than traditional SSH keys.

Another reason to use Tailscale instead of a jump host is that using a jump host creates added latency, especially when the jump host is not near the destination server. The speed of light is only so fast. Jump hosts centralize traffic, which increases latency because all traffic has to pass through the host. If your laptop is in San Francisco, your jump host is in Toronto, and your server is in Seattle, your traffic is bouncing across the continent up to four times for a single packet. Imagine how that adds up. With Tailscale, centralization is avoided by allowing users to connect to each other directly, significantly reducing latency. This lets your laptop in San Francisco connect directly to your server in Seattle, which is way faster.

In this article, you learned what jump hosts are as well as the benefits and pitfalls of using them. You also learned how to use a jump host to access a remote server using SSH and Remote Desktop Protocol, as well as the advantages and disadvantages of each of these methods. Finally, you saw how Tailscale can offer you a more secure way to access a remote server. 2b1af7f3a8