I'm getting inconsistent results scanning with plugin 19288 (VNC security
types).  Scanning the same machines, I sometimes get:

  The remote VNC server chose security type #0 (Invalid)
  Any user can connect to it without authentication, and thus take
  control of this machine.

and other times get:

  The remote VNC server chose security type #2 (VNC authentication)

I'm scanning with Windows Nessus 3.0.4 build W306.  Target machines are
Win/2K or Win/XP with RealVNC 3.3.7.  I can make VNC connections to the
target machines using a password, and if I try to clear the password with
this version of VNC, it says it won't accept connections with no password.
I think I always get security type #0 for localhost.
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