Clear Putty’s Cache
For all those of you who have been trying to clear Putty’s cache of host fingerprints (Windows) for development or testing, here is the answer:
1. Open the registry (regedit)
2. Go to HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\SshHostKeys
There you should see Putty’s cache of host keys.
The ‘name’ column tells you which key is for which server.
For example, it will have the format of
3. Delete the rows that you need and presto!
That’s all there is to it.
Reference : Clear Putty Cache