H.6.5 PLUGIN_PROTOCOL_REJECT

Direction: plugin to client

When: sent after PLUGIN_PROTOCOL

What happens next: the client will either send another PLUGIN_PROTOCOL or terminate the session

Message contents after the type code:

• string: an error message to present to the user, explaining why the plugin cannot help with this authentication protocol.

  An example might be ‘unable to open <config file>: <OS error message>’, if the plugin depends on some configuration that the user has not set up.

  If the plugin does not support this this particular authentication protocol at all, this string should be left blank, so that no message will be presented to the user at all.