ssh2

[OpenSSH Logo]You can login to a remote Linux server without entering password in 3 simple steps using ssky-keygen and ssh-copy-id as explained in this article.

ssh-keygen creates the public and private keys. ssh-copy-id copies the local-host’s public key to the remote-host’s authorized_keys file. ssh-copy-id also assigns proper permission to the remote-host’s home, ~/.ssh, and ~/.ssh/authorized_keys.

This article also explains 3 minor annoyances of using ssh-copy-id and how to use ssh-copy-id along with ssh-agent.
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SSH Key based authentication setup from openSSH to SSH2

by Ramesh Natarajan on July 27, 2008

OpenSSHThe previous articles (openSSH to openSSH setup, SSH2 to SSH2 setup) explains about how to setup key based authentication on the same version of ssh to perform ssh and scp without entering password. This article explains how to setup SSH key based authentication between different version of SSH (from openSSH to SSH2) to perform ssh and scp without entering password.
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Howto resolve Algorithm negotiation failed issue on SSH

by Ramesh Natarajan on July 2, 2008

OpenSSH

 
While performing ssh from a local-host to a remote-host that are on different versions of ssh, it is possible that you may get “Algorithm negotiation failed” message.  In this post, I’ll explain how to resolve this issue from the ssh client.

 
1. Unable to ssh to remote-host: In this example, when trying to perform ssh from local-host to remote-host, we get the “Algorithm negotiation failed” error message as shown below. Please note that the local-host is running ssh2 client.
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I explained previously how to Perform SSH and SCP without entering password on openSSH. In this article, I’ll explain how to setup the key based authentication on SSH2 and perform SSH/SCP without entering password using the following 10 steps.
1. Verify that the local-host and remote-host are running SSH2. Please note that ssh and scp is a symbolic link to ssh2 and scp2 respectively as shown below.

[local-host]$ ls -l /usr/local/bin/ssh /usr/local/bin/scp
lrwxrwxrwx  1 root root 4 Mar 10 22:04 /usr/local/bin/scp -> scp2
lrwxrwxrwx  1 root root 4 Mar 10 22:04 /usr/local/bin/ssh -> ssh2
[local-host]$ ssh -V
ssh: SSH Secure Shell 3.2.9.1 (non-commercial version) on i686-pc-linux-gnu

[remote-host]$ ls -l /usr/local/bin/ssh /usr/local/bin/scp
lrwxrwxrwx  1 root root 4 Mar 10 22:04 /usr/local/bin/scp -> scp2
lrwxrwxrwx  1 root root 4 Mar 10 22:04 /usr/local/bin/ssh -> ssh2
[remote-host]$ ssh -V
ssh: SSH Secure Shell 3.2.9.1 (non-commercial version) on i686-pc-linux-gnu

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5 Basic Linux SSH Client Commands

by Ramesh Natarajan on May 27, 2008

OpenSSH

Let us review the following 5 basic command line usage of the ssh client.

  1. Identify SSH client version
  2. Login to remote host
  3. Transfer Files to/from remote host
  4. Debug SSH client connection
  5. SSH escape character usage: (Toggle SSH session, SSH session statistics etc.)

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