>       I don't know how a VNC server handles session requests, 
> but I suppose a brute force robot tries one password before 
> trying another one instead of initiating n sessions at the 
> same time.  Well, you know, iterative, or else it's not 
> called "brute force".  And I suppose it needs 1 second to try 
> a password (ie request a session from client, reponse from 
> server to ask for password and a final refuse from server).  
> So in 3 minutes, it would have tried 300 passwords.  Is it 
> too many?

Your suppositions are incorrect.

VNC includes code to prevent hosts from repeatedly trying to authenticate in
order to perform a brute-force password attack.

Wez @ RealVNC Ltd.
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