What version/build of FlashFXP are you using?
What SSH key format did you import from?
Did you import the private key?
(the public key is stored on the server and the private key is used by the client)
Did you select the correct key for the site via the site manager?
Quote:
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Host key algorithm ssh-RSA, size 2048 bits.
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This has no direct relationship to the size of the public key used for account authentication.