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I'm not an expert is public/private keys, but a *long* time ago I created .PPK keys with PuTTY. And I've been able to happily connect to PUB400 with both VSCODE/Code4i and PuTTY without needing a password for months.

I can still connect with Code4i, but as of Feb 16, 2026 PuTTY says "Server refused our key" and defaults to needing a password. (Which it accepts and then connects.)

- Does Code4i do something different that makes the .PPK keys work?
- Is it possible that PUB400 can be configured to reject .PPK keys?
- Is there a recommended format for keys? RSA, DSA, ECDSA, etc, if/when I generate a new one.

Any help would be appreciated.
Thanks, Sam

(I tried with PuTTY in Windows CMD and found in the log that it rejected my .PPK key with "invalid format". But this same key works with Code4i. Strange...)


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