\H{errors-hostkey-absent} \q{The server's host key is not cached in
the registry}
+\cfg{winhelp-topic}{errors.hostkey.absent}
+
This error message occurs when PuTTY connects to a new SSH server.
Every server identifies itself by means of a host key; once PuTTY
knows the host key for a server, it will be able to detect if a
\H{errors-hostkey-wrong} \q{WARNING - POTENTIAL SECURITY BREACH!}
+\cfg{winhelp-topic}{errors.hostkey.changed}
+
This message, followed by \q{The server's host key does not match
the one PuTTY has cached in the registry}, means that PuTTY has
connected to the SSH server before, knows what its host key
... below the configured warning threshold}
This occurs when the SSH server does not offer any ciphers which you
-have configured PuTTY to consider strong enough.
+have configured PuTTY to consider strong enough. By default, PuTTY
+puts up this warning only for single-DES encryption.
See \k{config-ssh-encryption} for more information on this message.
may be able to improve the situation by using keepalives; see
\k{config-keepalive} for details on this.
+Note that Windows can produce this error in some circumstances without
+seeing a connection reset from the server, for instance if the
+connection to the network is lost.
+
\H{errors-connrefused} \q{Network error: Connection refused}
This error means that the network connection PuTTY tried to make to