Well, I started to remember that some days ago today, I had been experimenting with PuTTY’s registry keys. So that answered my question: “Why did FileZilla warn me this morning?” “Because the key was not cached”.īut then I was left with another question: “Why is the key no longer cached, because it was cached?” That confirms that FileZilla reads and writes PuTTY’s registry fingerprint cache.
One last check: I modified the registry entry and started FileZilla again:Īnd now FileZilla warns me that the key is different.
After some searching, I found the answer:Īnd indeed, when I start FileZilla again and allow it to cache the key, it appears in PuTTY’s registry keys. Then I’m taking a look with ProcMon to figure out where FileZilla caches its fingerprints. Then I went to the registry, but there’s no FileZilla entry under my HKCU Software key. What’s going on here? I started to search through FileZilla configuration files (XML files) looking for the cached fingerprints, and found nothing. I checked the fingerprint on my server, and it matched the one presented by FileZilla. I logged in over SSH, and my SSH client did not show a warning. This morning, I connected to my server over SFTP with FileZilla, and got this prompt: Today I figured out that FileZilla uses PuTTY‘s registry key (HKCU\SOFTWARE\SimonTatham\PuTTY\SshHostKeys) to cache SSH fingerprints.
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