Cygwin sshd RSA host key has just been changed

When you get the following errors from SSHD, you'll never be able to connect to your SSHD server.

bash$ ssh your_id@your_server_ip
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
xx:d3:xx:61:58:xx:fc:ee:1a:xx:da:9a:xx:42:xx:d1.
Please contact your system administrator.
Add correct host key in /home/your_id/.ssh/known_hosts to get rid of this message.
Offending key in /home/your_id/.ssh/known_hosts:52
RSA host key for your_server_ip has changed and you have requested strict checking.
Host key verification failed.
bash$

To fix the problem:
1. Modify .ssh/known_hosts: Remove the line with your_server_ip.
your_server_ip ssh-rsa AAAAB3NzaC1yc2EasdfawAAAIExxVkLHiIpIKDAasdfaxQwUgJ90asdfjoejcxxxkxlKineYdiVb/iZxxxj3yxQf4q2CR8UNuaXJLgmU6G6IrCHtuv0N+xxxyw1cmlRxxx5QEMuYawJmiq87ukcW3zasdfadsffrheF6e7CFwUnD747xxxxxxYN5asdfbcasdfashg5XeymM=
2. bash$ ssh your_id@your_server_ip to try to reconnect to your sshd server.