Frequently Asked Questions About Linux / UNIX » fingerprint http://www.cyberciti.biz/faq Every answer asks a more beautiful question. Fri, 03 Feb 2012 22:38:32 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Linux / Unix: Disable OpenSSH Host Key Checkinghttp://www.cyberciti.biz/faq/linux-appleosx-howto-disable-ssh-host-key-checking/ http://www.cyberciti.biz/faq/linux-appleosx-howto-disable-ssh-host-key-checking/#comments Fri, 30 Dec 2011 11:37:09 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=11310 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 e1:9b:5c:16:a6:cd:11:10:3a:cd:1b:a2:16:cd:e5:1c. 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?]]> http://www.cyberciti.biz/faq/linux-appleosx-howto-disable-ssh-host-key-checking/feed/ 2 Identify A Remote Host Apps and OS Using UNIX / Linux Command Linehttp://www.cyberciti.biz/faq/identify-remote-host-by-unix-linux-command/ http://www.cyberciti.biz/faq/identify-remote-host-by-unix-linux-command/#comments Wed, 10 Jun 2009 22:52:59 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=7648 How do I identify remote server os and apps using UNIX or Linux command line options?]]> http://www.cyberciti.biz/faq/identify-remote-host-by-unix-linux-command/feed/ 0 Linux Generate RSA SSH Keyshttp://www.cyberciti.biz/faq/linux-generating-rsa-keys/ http://www.cyberciti.biz/faq/linux-generating-rsa-keys/#comments Wed, 27 May 2009 19:49:20 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=7561 How do I generate ssh RSA keys under Linux operating systems?]]> http://www.cyberciti.biz/faq/linux-generating-rsa-keys/feed/ 0 Linux / UNIX: Generate SSH Keyshttp://www.cyberciti.biz/faq/linux-unix-generating-ssh-keys/ http://www.cyberciti.biz/faq/linux-unix-generating-ssh-keys/#comments Wed, 27 May 2009 19:27:16 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=7556 How do I generate ssh keys under Linux / UNIX / Mac OS X and BSD operating systems for remote login?]]> http://www.cyberciti.biz/faq/linux-unix-generating-ssh-keys/feed/ 0 Ubuntu / Debian Linux Regenerate OpenSSH Host Keyshttp://www.cyberciti.biz/faq/howto-regenerate-openssh-host-keys/ http://www.cyberciti.biz/faq/howto-regenerate-openssh-host-keys/#comments Sun, 15 Jun 2008 13:35:02 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1115 http://www.cyberciti.biz/faq/howto-regenerate-openssh-host-keys/feed/ 5 Fingerprint / Identify Remote Web Serverhttp://www.cyberciti.biz/faq/find-out-remote-webserver-name/ http://www.cyberciti.biz/faq/find-out-remote-webserver-name/#comments Mon, 28 Jan 2008 09:07:33 +0000 Vivek Gite http://www.cyberciti.biz/faq/find-out-remote-webserver-name/ http://www.cyberciti.biz/faq/find-out-remote-webserver-name/feed/ 2 Mac OS X Remove SSH Known Hosthttp://www.cyberciti.biz/faq/mac-os-x-remove-known-host/ http://www.cyberciti.biz/faq/mac-os-x-remove-known-host/#comments Sat, 15 Dec 2007 16:05:38 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=6011 I've reinstalled Linux on remote server and now trying to connect it over ssh using Mac OS X:

ssh user@server1.example.com

But I'm getting an error which read as follows:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ 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 5c:9b:16:56:a6:cd:11:10:3a:cd:1b:a2:91:cd:e5:1c. Please contact your system administrator. Add correct host key in /Users/user/.ssh/known_hosts to get rid of this message. Offending key in /Users/user/.ssh/known_hosts:1 RSA host key for server1.example.com has changed and you have requested strict checking. Host key verification failed.

How do I fix this problem under Mac OS X?]]> http://www.cyberciti.biz/faq/mac-os-x-remove-known-host/feed/ 0