vnc 4.0, NAT, connection reset

Sertar Yalciner oyuncubey "at" yahoo.com
Fri Jan 2 14:51:01 2004


I would like to use port 9000 on the modem but I am
also behind a NAT in the office and I am only allowed
for ftp and http. I use http for my modem's remote
mgmt and the ftp port is the only one left. In th
emean time, what you suggest seems logical (i.e.
modem's tracking of ftp flow.) I will check it also. 

thanks for the tip.
sertar


--- Rasjid Wilcox <rasjidw "at" openminddev.net> wrote:
> On Friday 02 January 2004 20:04, Sertar Yalciner
> wrote:
> > Hi,
> > I have spent two days searching the net but could
> not
> > get my scenario work. Any help will be greatly
> > appreciated.
> >
> > - I have vnc4 listening port 9000 on win2k
> > - my dsl modem translates the port 21 to port 9000
> on
> > internal vnc server
> > - when i telnet to port 21 on dsl modem i get the
> rfb
> > message, so nat is working
> >
> > - when I run the viewer like mydslip::21 (vnc4
> allows
> > this) I get a "connection reset by peer" message.
> > - When I put a secndary laptop to ibternal net and
> run
> > vnc viewer there, it works fine.
> 
> Port 21 is the ftp control port.  Perhaps the dsl
> modem/router assumes that it 
> is forwarding a ftp connection, and is doing
> connection tracking based on the 
> contents of the connection, which could then cause
> it to get rather confused, 
> since the traffic will bear no relationship to what
> it expects.
> 
> Why are you using port 21?  Can you get it just to
> forward port 9000 (or some 
> other non-special port) to your win2k box?
> 
> Cheers,
> 
> Rasjid.
> 
> -- 
> Rasjid Wilcox
> Canberra, Australia (UTC +10 hrs)
> http://www.openminddev.net


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