I‘ve a remote Unix server running with OpenSSH remote login service. The openssh is configured for passwordless login using ssh keys. Our ISP allows to boot all Linux servers into the rescue mode. It allow us to bring a server online remotely in order to troubleshoot system problems that would normally only be resolved by an OS Reload (such as accidentally deleting files or wrong firewall configurations blocking ssh access). When server boots into a remote rescue mode I can connect using SSH. They SSH keys will not be the same in the rescue mode so I get key mismatch messages as SSH keys are re-generated on each boot:
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:1
RSA host key for www.cyberciti.biz has changed and you have requested strict checking.
Host key verification failed.
How do I ignore OpenSSH hos key checking from my Apple OS X laptop while login using the ssh?
How do I hide ssh number from clients? When I type the following command it displays server version number to end users:
ssh -v server2.example.com
OpenSSH_5.3p1 Debian-3ubuntu4, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /home/vivek/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to server2.example.com [123.x.y.z] port 22.
debug1: Connection established.
debug1: identity file /home/vivek/.ssh/identity type -1
debug1: identity file /home/vivek/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/vivek/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH_4*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu4
telnet server2.example.com 22
Connected to v.txvip1.
Escape character is '^]'.
Why does OpenSSH server report its version to clients?
ow do I install my SSH public key ~/.ssh/id_rsa.pub onto a remote Linux and UNIX server automatically from Linux workstation or Apple OS X laptop without using scp and/or copy & paste method?
How do I enable OpenSSH SSH server to listen on an IPv6 address under Linux or UNIX operating systems?
There is no rc.d script provided under OpenBSD for sshd service. How do I restart OpenSSH sshd server without rebooting OpenBSD 4.x server?
What is the difference between authentication and authorization? Why it is important to understand difference between the two? Authentication vs. Authorization — what are they and how do they differ?
ow do I login over ssh without using password less RSA / DSA
public keys? How do I use ssh in a shell script? How do I login non-interactivly performing password authentication with SSH and shell scripts?