What on Earth is Session Zero?

James Weatherall jnw "at" realvnc.com
Tue Nov 1 23:03:01 2005


Stephen,

You have not mentioned seeing error 10065 before.  Error 10065 means
"destination host unreachable", i.e. there is absolutely no way to
communicate with the specified computer.  This strongly suggests that the IP
address that you are specifying is incorrect.

VNC server is *not* "refusing all connections".  The network stack of the
computer that is receiving connection attempts is refusing the connections -
they are never reaching VNC Server.

You are incorrect in concluding that VNC Server is incompatible with Windows
XP Home Edition.  All current VNC 4 series software is compatible with
Windows XP Home Edition.

Wez @ RealVNC Ltd.


> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com 
> [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Stephen
> Sent: 01 November 2005 20:15
> To: John Aldrich
> Cc: vnc-list "at" realvnc.com
> Subject: Re: What on Earth is Session Zero?
> 
> 
> ----- Original Message -----
> From: "John Aldrich" <JAldrich "at" covista.com>
> To: "'Stephen'" <stephen "at" sptv.demon.co.uk>; "Steven D. Clark" 
> <sdclark "at" cnrgroup.com>
> Cc: <vnc-list "at" realvnc.com>
> Sent: Tuesday, November 01, 2005 7:48 PM
> Subject: RE: What on Earth is Session Zero?
> 
> 
> > Stephen:
> > How, EXACTLY are you trying to connect? Your connection 
> dialog window
> should
> > have something like this: remotemachine:20 or (better) 
> > remotemachine::5920 If you're just typing in "remotemachine" and 
> > hitting "connect" that
> explains
> > it. VNC is NOT listening on 5900 on the XP box and unless 
> you specify 
> > the port number, you're going to get that error.
> 
> This is what I type in to VNC Viewer
> ip address:5920
> At the other end both User Mode and Service Mode 
> configuration windows are set for 5920 and http 5820.
> 
> Previously, the ME PC at the other end was always off, User 
> Mode and Service Mode configuration windows on the XP PC were 
> on their default settings 5900 and http 5800, and I was 
> typing this in to VNC Viewer ip address:5900
> 
> The result has always been Error 10061, or 10065. The router 
> at the remote end is wide open to all incoming connections, 
> Windows Firewall is off, winvnc4.exe is listed as an 
> exception in Windows Firewall anyway, and there is no other 
> firewall or security software installed. As far as I can tell 
> Real VNC server is running, listening, and refusing all 
> connections. Since there is no setting in the Real VNC server 
> configuration which I can alter to change this, I concluded 
> that Real VNC is not compatible with Windows XP Home Edition.
> 
> > -----Original Message-----
> > From: vnc-list-admin "at" realvnc.com 
> [mailto:vnc-list-admin "at" realvnc.com]On
> > Behalf Of Stephen
> > Sent: Tuesday, November 01, 2005 2:22 PM
> > To: Steven D. Clark
> > Cc: vnc-list "at" realvnc.com
> > Subject: Re: What on Earth is Session Zero?
> >
> >
> > ----- Original Message -----
> > From: "Steven D. Clark" <sdclark "at" cnrgroup.com>
> > To: <vnc-list "at" realvnc.com>
> > Sent: Tuesday, November 01, 2005 3:53 PM
> > Subject: Re: What on Earth is Session Zero?
> >
> > > Does XP Home allow you to run "netstat -a" in a command 
> window? You 
> > > should see the following lines if VNC is listening:
> > >
> > >   TCP    <name-of-xp-box>:5800     <name-of-xp-box>:0     
>    LISTENING
> > >   TCP    <name-of-xp-box>:5900     <name-of-xp-box>:0     
>    LISTENING
> >
> > Yes it does. Below is my result from netstat -a on the XP 
> PC.This was
> after
> > connecting it with "Add New Client" from the remote end, 
> and starting 
> > up Windows Media Encoder on Port 8080. The RealVNC ports 
> are 5920 and 
> > 5820. A Windows ME computer (192.168.0.2 on the router also at the 
> > remote end)
> uses
> > Real VNC on 5900 and 5800 when it is on, and I CAN get into to that 
> > one
> with
> > RealVNC Viewer. The refusal to connect on the XP PC I need 
> > (192.168.0.3 on the router at the remote end) does not 
> change whether 
> > the ME PC is on or off. The router is configured to allow 
> everything 
> > inbound to both as here:
> >
> > Inbound Services
> >  #  Enable  Service Name  Action  LAN Server IP address  
> WAN Users  Log
> >  1   Yes Any(ALL)  ALLOW always  192.168.0.2  Any  Always
> >  2   Yes Any(ALL)  ALLOW always  192.168.0.3  Any  Always
> >  Default  Yes  Any  BLOCK always  Any  Any  Never
> >
> > netstat -a
> > Active Connections
> >
> >   Proto  Local Address           Foreign Address        State
> >   TCP    YOUR-91C305C62F:epmap   YOUR-91C305C62F:0      LISTENING
> >   TCP    YOUR-91C305C62F:microsoft-ds   YOUR-91C305C62F:0   
>    LISTENING
> >   TCP    YOUR-91C305C62F:2869    YOUR-91C305C62F:0      LISTENING
> >   TCP    YOUR-91C305C62F:5820    YOUR-91C305C62F:0      LISTENING
> >   TCP    YOUR-91C305C62F:5920    YOUR-91C305C62F:0      LISTENING
> >   TCP    YOUR-91C305C62F:8080    YOUR-91C305C62F:0      LISTENING
> >   TCP    YOUR-91C305C62F:1028    YOUR-91C305C62F:0      LISTENING
> >   TCP    YOUR-91C305C62F:netbios-ssn   YOUR-91C305C62F:0    
>   LISTENING
> >   TCP    YOUR-91C305C62F:1049    sptv.demon.co.uk:5500  ESTABLISHED
> >   TCP    YOUR-91C305C62F:8080    sptv.demon.co.uk:1159  ESTABLISHED
> >   TCP    YOUR-91C305C62F:8080    sptv.demon.co.uk:1174  FIN_WAIT_2
> >   UDP    YOUR-91C305C62F:microsoft-ds   *:*
> >   UDP    YOUR-91C305C62F:isakmp   *:*
> >   UDP    YOUR-91C305C62F:1069    *:*
> >   UDP    YOUR-91C305C62F:4500    *:*
> >   UDP    YOUR-91C305C62F:ntp     *:*
> >   UDP    YOUR-91C305C62F:1035    *:*
> >   UDP    YOUR-91C305C62F:1900    *:*
> >   UDP    YOUR-91C305C62F:ntp     *:*
> >   UDP    YOUR-91C305C62F:netbios-ns   *:*
> >   UDP    YOUR-91C305C62F:netbios-dgm   *:*
> >   UDP    YOUR-91C305C62F:1900    *:*
> >
> >
> > > ----- Original Message -----
> > > From: "John Aldrich" <JAldrich "at" covista.com>
> > > To: "'Stephen'" <stephen "at" sptv.demon.co.uk>; <vnc-list "at" realvnc.com>
> > > Sent: Tuesday, November 01, 2005 8:16 AM
> > > Subject: RE: What on Earth is Session Zero?
> > >
> > >
> > > > Stephen:
> > > > Are you running any antivirus software, such as "Norton Internet
> > > Security"?
> > > > There is sufficient anecdotal evidence that some antivirus 
> > > > products
> > > actively
> > > > block VNC because they perceive it as "malware" due to the fact 
> > > > that
> it
> > > > could be misused.
> > > >
> > > > The first thing I would try is to connect from your 
> Windows ME box 
> > > > to
> > your
> > > > XP box and see if that works. If it doesn't, try the following: 
> > > > Start ->Run ->Telnet <ip.of.xp.box> 5900 and see if you get an 
> > > > "RFB" prompt. If you don't, then your machine is
> > not
> > > > accepting connections. My XP Pro box appears to be 
> having the same
> > > problem,
> > > > but I'm not blaming it on VNC, because it works fine on other XP
> boxes.
> > > > _______________________________________________
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