SSH
clients by default store the key fingerprint of the SSH
servers that it has connected to. This is to establish a list of known hosts and for the server's key fingerprint to be checked against the stored copy of the fingerprint every time a connection is to be established.
You'll get a warning if the server's key fingerprint does not match the one locally stored and you will not be able to log in to the server. For this you'll have to update stored known host's SSH
key fingerprint.
OpenSSH
clients on Linux
and other Unix
-based operating systems store the key fingerprints in ~/.ssh/known_hosts
file while PuTTY
in Windows
store these information in the system registry.
Registry Editor
by running regedit
from the search bar. Yes
to allow registry editor to make changes to the system. Computer
→ HKEY_CURRENT_USER
→ Software
→ SimonTatham
→ PuTTY
→ SshHostKeys
from the tree list. OK
to save. Delete
to delete the host key fingerprint. Yes
to confirm the deletion. Comment anonymously. Login not required.