WinVNC server connecting automatically to clients over WAN

Alex Angelopoulos alex "at" bittnet.com
Thu, 31 Jan 2002 12:44:17 +0000


There is no discover process that occurs.  One thing that might be
related is if you have communication errors over the link, there may be
a lot of traffic generated since VNC uses pure TCP (no UDP) for
connection. Is there anything in particular the remote user is running
on the server they are accessing with VNC when this happens?

----- Original Message -----
From: <Barry.Boyd "at" steeltechnologies.com>
To: <vnc-list "at" uk.research.att.com>
Sent: Thursday/2002 January 31 07:25
Subject: RE: WinVNC server connecting automatically to clients over WAN


: The problem we are having is that the Local LAN is experiencing a lot
of
: Network Traffic  I Look what is going on and I see A lot of traffic
being
: generated between the Server and a remote client.  The only thing that
was
: added recently and that the two have in common is VNC.  I stopped the
VNC
: service on the NT server and utilization drops  to normal levels...I
guess I
: was wondering if there was some kind of setting that like a "Discover"
: process that VNC uses when it starts or anything else that would cause
this
: problem.
:
: -----Original Message-----
: From: Alex Angelopoulos [mailto:alex "at" bittnet.com]
: Sent: Wednesday, January 30, 2002 9:44 PM
: To: vnc-list "at" uk.research.att.com
: Subject: Re: WinVNC server connecting automatically to clients over
WAN
:
:
: I may be misinterpreting what you said, but it appears you're saying
: that the VNC client connections drop as soon as you stop the VNC
: service.  That's expected; they are no longer connected to anything.
:
: Does NetxXray show you the connected ports?
:
: If not, you can go to the server and issue this command in a console
: prompt:
:
: netstat -an
:
: this will show you all connections in numeric form.  You should see on
: the lefthand side the server address listing and ports; for example,
if
: the server address is 192.168.1.1 you will see lines like
:
: UDP 192.168.1.1:139 yadda-yadda
: TCP 192.168.1.1:5900 yadda
:
: Connections to port 59xx on the server  are from *live* VNC
connections.
: If you have connections on port 139, those are Windows clients
actually
: accessing fileshares over the network.  See if you are showing clients
: on port 139.
:
:
:
: ----- Original Message -----
: From: <Barry.Boyd "at" steeltechnologies.com>
: To: <vnc-list "at" uk.research.att.com>
: Sent: Monday/2002 January 28 15:15
: Subject: WinVNC server connecting automatically to clients over WAN
:
:
: : NT Sever SP 6a.  running WinVNC sever as a service.  After
installing
: Local
: : LAN user started complaining of  slow network response.  Using
NetXray
: I saw
: : Remote clients connecting to the server  only clients that are
: connecting
: : are the ones with WinVnc.  I stop the VNC service on the server and
: the
: : connections dropped.  Any Ideas why this would be happening.
:
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