Hi Mark, VNC 3.3.3r2 is an extremely old version. Simply upgrading to a VNC 4 series server will address Joel's issue.
Cheers, Wez @ RealVNC Ltd > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mark Rainford > Sent: 25 April 2007 13:24 > To: [EMAIL PROTECTED] > Cc: vnc-list@realvnc.com > Subject: Re: too many authentication errors > > > [EMAIL PROTECTED] wrote: > > > I've been using VNC happily for for many years now, with > a Xvnc server > > > (Xvnc version 3.3.3r2+tight1.1p9) and a variety of clients, most > > > recently RealVNC 4.1.2 > > > > > > Last week, I found I could no longer connect, because of "too many > > > authentication errors." It seems that someone has been > trying, so far > > > unsuccessfully, to break into my Xvnc server. > > This problem is present in AT&T Xvnc version 3.3.3r2 (dunno > about other > versions). > > It's an attempt to protect against password guesses, but > unhappily goes > awry. > > After 5 bad password attempts a back-off kicks in for a few > minutes which > refuses *all* new connections with error "Too many authentication > failures". The back-off period is re-doubled for each > refused connection. > It only takes a handful of these to lock the server out to > new clients for > hundreds of hours. > > AFAIK the only cure is to fix your copy of the source code, or find a > version which doesn't have this behaviour. Alternatively, > try to minimise > exposure of your vnc port, eg by using a port number well out of the > common range for scanners, or by restricting access at the > network level. > > -- > Regards, Mark. > _______________________________________________ > VNC-List mailing list > VNC-List@realvnc.com > To remove yourself from the list visit: > http://www.realvnc.com/mailman/listinfo/vnc-list _______________________________________________ VNC-List mailing list VNC-List@realvnc.com To remove yourself from the list visit: http://www.realvnc.com/mailman/listinfo/vnc-list
