Server refused our key after attempting to login with putty

I have been using filezilla and putty all day today. Now, I can use neither. putty says server refused our key and filezilla simply will not connect to server Authentication failed.

I tried using root password in putty but had no luck with that either.

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There’s really not much to go on - if your key doesn’t work, either you’re not providing the key properly, or your server’s authorized_keys file does not contain that key.