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Where is PuTTY Repository

PuTTY Security Alert - Save or Replace Server Host RSA Key

PuTTY Security Alert

I guess you may have seen this alert like the above featured image while you were connecting to a server for the first time over SSH using PuTTY.

If this is not the first time you connect to the server, the server should have changed its key, or most likely, the IP address has been failed over to another machine.

Once you confirmed the key, it saves the new key or replaces the old key for the host in the repository. If you want to add a new key, delete or replace an old key manually, you should know where to find PuTTY repository.


In Windows platform, the PuTTY repository is in Windows Registry (regedit). Its hierarchy is as:

  • Software
  • SimonTatham
  • PuTTY
  • This is the repository of putty, we should drill down a little bit.

  • SshHostKeys

In other words, the full path is HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\SshHostKeys.

PuTTY - regedit server host RSA key
PuTTY - regedit server host RSA key

The above screenshot should be a good navigation for finding PuTTY repository.

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