Warning: Remote Host Identification Has Changed error and solution

When I run ssh command I get 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 /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:1
RSA host key for ras.mydomain.com has changed and you have requested strict checking.
Host key verification failed.

How do I get rid of this message?

If you have reinstalled Linux or UNIX with OpenSSH, you will get the above error. To get rid of this problem:

Solution #1: Remove keys

Use the -R option to removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts. If your remote hostname is server.example.com, enter:
$ ssh-keygen -R {server.name.com}
$ ssh-keygen -R {ssh.server.ip.address}
$ ssh-keygen -R server.example.com
Sample output:

/home/vivek/.ssh/known_hosts updated.
Original contents retained as /home/vivek/.ssh/known_hosts.old

Now, you can connect to the host without a problem.

Solution #2: Add correct host key in /home/user/.ssh/known_hosts

It is not necessary to delete the entire known_hosts file, just the offending line in that file. For example if you have 3 server as follows.
myserver1.com,64.2.5.111 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEA11FV0EnGahT2EK8qElocjuHTsu1jaCfxkyIgBTlxlrOIRchb2pw8IzJLOs2bcuYYfa8nSXGEcWyaFD1ifUjfHelj94AAAAB3NzaC1yc2EAAAABIwAAAIEA11FV0E
nGahT2EK8qElocjuHTsu1jaCfxkyIgBTlxlrOIRchb2pw8IzJLOs2bcuYYfa8nSXGEcWyaFD1ifUjfHelj94H+uv304/ZDz6xZb9ZWsdm+264qReImZzruAKxnwTo4dcHkgKXKHeefnBKyEvvp/2ExMV9WT5DVe1viVwk=
myserver2.com,125.1.12.5 ssh-rsa
AAAAB3NzaC1yc2EAAAABIwAAAQEAtDiERucsZzJGx/1kUNIOYhJbczbZHN2Z1gCnTjvO/0mO2R6KiQUP4hOdLppIUc9GNvlp1kGc3w7B9tREH6kghXFiBjrIn6VzUO4uwrnsMbnAnscD5EktgI7fG4ZcNUP 5+J7sa3o+rtmOuiFxCA690DXUJ8nX8yDHaJfzMUTKTGxQz4M/H2P8L2R//qLj5s3ofzNmgSM9lSEhZL/IyI4NxHhhpltYZKW/Qz4M/H2P8L2R//qLj5s3ofzNmgSM9lSEhZL/M7L0vKeTObue1SgAsXADtK3162a/Z6MGnAazIviHBldxtGrFwvEnk82+GznkO3IBZt5vOK2heBnqQBfw=
myserver3.com,125.2.1.15 ssh-rsa
5+J7sa3o+rtmOuiFxCA690DXUJ8nX8yDHaJfzMUTKTGx0lVkphVsvYD5hJzm0eKHv+oUXRT9v+QMIL+um/IyI4NxHhhpltYZKW
as3533dka//sd33433////44632Z6MGnAazIviHBldxtGrFwvEnk82/Qz4M/H2P8L2R//qLj5s3ofzNmgSM9lSEhZL/M7L0vKeTObue1SgAsXADtK3162a/Z6MGnAazIviHBldxtGrFwvEnk82+GznkO3IBZt5vOK2heBnqQBfw==

To delete 2nd server (myserver.com), open file:
# vi +2 .ssh/known_hosts
And hit dd command to delete line. Save and close the file. Or use following
$ vi ~/.ssh/known_hosts
Now go to line # 2, type the following command
:2
Now delete line with dd and exit:
dd
:wq


Solution 3: Just delete the known_hosts file If you have only used one ssh server

$ cd
$ rm .ssh/known_hosts
$ ssh ras.mydomain.com


Now you should be able to connect your server via ssh.

AT91RM9200 Documents

Please check the below link. you will get all details.
http://opencircuits.com/Linuxstamp#Description

Linux driver source code

Below web site will help you to get source file.
http://www.mjmwired.net/kernel/Documentation/rtc.txt

Circuit and PCB

The Below website will help you to get PCB and circuit diagram.
http://www.microbuilder.eu

GNOME2 IP Messenger

A few things about GNOME2 IP Messenger (g2ipmsg), though.

Make sure you have all dependencies installed:

• libxml-parser-perl


• libgnomeui-dev


• libpanel-applet2-dev

(UPDATE 2008-07-06 2:35AM -- additional dependencies)

• gettext


• intltool

How to install these depends on the Linux distribution. The easiest way is to use the graphical Package Manager.

(MAJOR UPDATE 2008-07-07 5:27PM)
Randell reported that he couldn't find the dependencies in Fedora -- I was surprised! I did a search and found out that libxml-parser-perl was perl-XML-parser in Fedora! I suppose that the rest of the dependencies are only for Debian-based distros. Randell said that he'd look up the rest, and post a Fedora instructional soon. With that, I'm slapping the apt-get command back into the list below.

After assuring that you have the above dependencies, you can do a conventional build and install from source. Assuming that the current working directory is where g2ipmsg-0.9.5.tar.gz is located:

 $ tar zxf g2ipmsg-0.9.5.tar.gz
 $ cd g2ipmsg-0.9.5/
 $ sudo apt-get install libxml-parser-perl libgnomeui-dev libpanel-applet2-dev gettext intltool
 $ ./configure
 $ make
 $ sudo make install
 $ sudo g2ipmsg

Make sure to execute sudo g2ipmsg right after installation. You'll only be able to run it without the sudo after a reboot -- I don't know why, though.

I suddenly posted something like this because while researching specifically about this, the search results with definite instructions were non-English sites.