This occurs when the SSH server does not offer any ciphers which you
have configured PuTTY to consider strong enough. By default, PuTTY
-puts up this warning only for \ii{single-DES} encryption.
+puts up this warning only for \ii{single-DES} and \i{Arcfour} encryption.
See \k{config-ssh-encryption} for more information on this message.