fix for ssh "too many authentication failures"

fix_too_many_ssh_auth_fails.txt

If ssh on - for example, Debian  - starts failing to log into a server even though you know you have the right key.
Also works when you intend to use a password but ssh client fails before allowing that method. 
You can tell the ssh client to ignore the default identity files and only attempt one specific file.

$ ssh -o 'IdentitiesOnly=yes'  -i ~/.ssh/correct_id_file user@host 

  IdentitiesOnly
             Specifies that ssh(1) should only use the authentication identity and certificate files explicitly configured 
             in the ssh_config files or passed on the ssh(1) command-line, 
             even if ssh-agent(1) or a PKCS11Provider offers more identities.
             The argument to this keyword must be yes or no (the default). 
             This option is intended for situations where ssh-agent offers many different identities.
             ...
             IdentityFile may be used in conjunction with IdentitiesOnly to select which identities in an agent are offered during authentication.  
             IdentityFile may also be used in conjunction with CertificateFile in order to provide any certificate also needed for authentication with the identity.