My private key is 13,500-bit passphrase-protected, generated by copSSH. When I try to import into Tunnelier it says "Decoding host key failed with the following error: unrecognized or invalid import format" Key file says: DEK-Info: DES-EDE3-CBC, and after converting to .ppk, PuTTY connects with it fine. Is there a way around this error with Tunnelier?
13,500 bits is huge overkill. Even if you're very paranoid, 4096 would be enough.
That being said, it sounds like the format is something Tunnelier would be able to import.
Can you generate another key similar to the one you aren't able to import, and send that key to us for testing? You can send it as an attachment if you open a new case:
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