RealVNC questions about ports and display number

James Weatherall jnw "at" realvnc.com
Tue Nov 8 18:33:01 2005


Dragos,

VNC doesn't have any "subtle requirements" of routers.  It simply requires
that they work as per the relevant specifications (IEEE802.11, Ethernet, IP,
etc).

The error that you described in your previous mail, doesn't sound at all
like the sort of thing you'll get from a broken router, but like a simple
misconfiguration issue.  It's either the case that you're attempting to
connect to a non-existent IP address, or to a system that has a firewall
preventing incoming connections to VNC Server, or to a router that has the
wrong port forwarding configured for the VNC ports.

As a simple test, can you connect to your VNC server computer using its LAN
address from another computer connected to the router?

Regards,

Wez @ RealVNC Ltd.


> -----Original Message-----
> From: Dragos Maciuca [mailto:dragos.maciuca "at" gmail.com] 
> Sent: 05 November 2005 03:41
> To: James Weatherall
> Cc: vnc-list "at" realvnc.com
> Subject: Re: RealVNC questions about ports and display number
> 
> James,
> 
> I'm willing to buy your last conjecture.  I know how to do port
> forwarding properly and my other gizmo works fine with port forwarding
> over wireless.  I assume VNC has some other subtle requirement which
> the damn router does not implement.  I didn't mean to complain about
> the VNC, I just meant to complain about the retail routers and maybe
> find out about at least one model that works.
> 
> Thanks a lot!
> 
> Dragos
> 
> 
> On 11/4/05, James Weatherall <jnw "at" realvnc.com> wrote:
> > Dragos,
> >
> > Error 10060 means that the computer using the IP address to 
> which you are
> > attempting to connect did not respond at all.  This is 
> nothing to do with
> > VNC, but indicates that you are using the wrong IP address, 
> the IP address
> > isn't reachable, you don't have port forwarding set up in 
> your router
> > correctly, or your port forwarding configuration is forwarding the
> > connection attempt to a non-existent IP address on your 
> LAN.  It's also
> > possible, if you're seeing this when testing from within 
> the same LAN, that
> > you have one of the many brands of broken routers that don't do port
> > forwarding correctly when traffic is sent to their external 
> address from
> > within the LAN.
> >
> > To reiterate the main point - this is *not* related to VNC, it's a
> > configuration issue with your router.
> >
> > Cheers,
> >
> > Wez @ RealVNC Ltd.
> >
> >
> > > -----Original Message-----
> > > From: Dragos Maciuca [mailto:dragos.maciuca "at" gmail.com]
> > > Sent: 04 November 2005 06:53
> > > To: James Weatherall
> > > Subject: Re: RealVNC questions about ports and display number
> > >
> > > Hi James!
> > >
> > > Let's say a computer is behind a retail router and 
> everything (port
> > > forwarding, connections, etc.) is setup properly, I can 
> connect to is
> > > just fine if that computer is connect via a Cat5 to the 
> router.  If,
> > > however, that same computer is connected via 802.11 to 
> the router then
> > > you can't connecto to it via VNC.  I get the 10060 error.  I've
> > > managed to repeat this with several setups and several 
> routers (mostly
> > > Negear and one Linksys).  As I mentioned before, I know that port
> > > forwarding works because I have another gizmo that needs port
> > > forwarding over 802.11 and it works fine.  So I honestly 
> don't know
> > > what's going on.
> > >
> > > Let me know if you want more details.
> > >
> > > Cheers!
> > >
> > > Dragos
> > >
> > >
> > > On 11/3/05, James Weatherall <jnw "at" realvnc.com> wrote:
> > > > Dragos,
> > > >
> > > > Can you explain what you mean when you say that your router
> > > doesn't work
> > > > with VNC?  What is the problem you are seeing?
> > > >
> > > > Cheers,
> > > >
> > > > Wez @ RealVNC Ltd.
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: vnc-list-admin "at" realvnc.com
> > > > > [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of 
> Dragos Maciuca
> > > > > Sent: 03 November 2005 14:22
> > > > > To: vnc-list "at" realvnc.com
> > > > > Subject: Re: RealVNC questions about ports and display number
> > > > >
> > > > > I'll reply to this message as a way of getting back on my
> > > soap box.  I
> > > > > have yet to find one retail router that can be used with
> > > VNC over the
> > > > > wireless connection.  I don't know what they are missing,
> > > but it's not
> > > > > the port forwarding part as I have another device 
> that needs port
> > > > > forwarding and it works fine over wireless.  As James
> > > found out, they
> > > > > work fine over wired connections.
> > > > >
> > > > > So, if someone knows of a retail router that can be used
> > > with VNC over
> > > > > the wireless connection, please let us know.
> > > > >
> > > > > Dragos
> > > > >
> > > > > >I have no problem coneting to my VNC inside my firewall ;-)
> > > > > >[even when I have two firewalls in-line]
> > > > > >I can connect to three machines inside
> > > > > >2 of windows XP Pro; Linux,
> > > > > >The problem I do have is connecting to my wireless  laptop
> > > > > >althoug I can connect to it when it is hardwired
> > > > > >
> > > > > >I can conect OUT with the wireless just not in
> > > > > >
> > > > > >Using DYNDNS.org
> > > > > >I can get clients to call me; I can call myself when I
> > > am off-site
> > > > > >
> > > > > >D-Link 804v Router
> > > > > >Virtual Server Settings
> > > > > >RULE    inside     IP
> > > > > >03.     192.168.8.100   5903 ~ 5903    - Linux Mandrake 10.1
> > > > > RealVNC 4.1
> > > > > >03.     192.168.8.100   88   ~ 88    - Linux Mandrake
> > > 10.1 WebServer
> > > > > >03.     192.168.8.100   22   ~ 22    - Linux Mandrake 10.1
> > > > > >04.     192.168.8.102     5907 ~ 5907    - XPPro 
> Server VNC 4.1.1
> > > > > >05.     192.168.8.101     5905 ~ 5905    - Laptop Server
> > > > > [display Zero]
> > > > > >06.     192.168.8.101     5500 ~ 5500     - Listening Viewer
> > > > > >07.     192.168.8.101     5708 ~ 5708     - Laptop 
> UserMode Steve
> > > > > >08.     192.168.8.101    5500 ~ 5500     - Laptop 
> UserMode Dale
> > > > > >09.     192.168.8.101     5805 ~ 5805     - Laptop Java
> > > > > [display Zero]
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