RealVNC kills TCPIP on XP SP2

[kletool]

Hi there,

a very nerving issue on XP SP2 (HP OEM) on an HP xw4600 (1GB, Intel Core2 Duo):
29. 2. 2008
First Problem fixed, were the MS- Drivers for the Eicon DIVA USB produced a Bluescreen with 0xd1 in diwan.sys. - Downloaded the "ISDN Client for XP_2003_Vista_4.5" from Dialogic - Upgrade.exe ... no more BSOD´s.

PPP-Connection to our W2k3-R2 RAS-Server over ISDN seems to work fine.
NetBios Access to our Servers has poor performance.

RealVNC to this PC seems to work fine for about a minute. When pressing the Start-Button the second time the VNCViewer stops. In the same second a ping running from the PC to the RAS-Server were getting timed-out.

A Reconnect of the VNCViewer from this point only shows about half of the remote screen. - Stuck again. - PC: no TCP/IP for 30 sec. - the timeout for the VNCViewer.

Only a newstart of PC and Viewer PC helps for 1 minute slow remote work.

Connection in the same way a Win2000 Workstation works very fine.
Connecting my Notebook (updated from 2000 to XP SP2) showing simmilar TCPIP-death.

I have not installed all Microsoft Patches - only the most important. - Waiting for SP3

VNCViewer from my AdminPC (W2k SP4) ends with complete TCPIP-death. "Frankie say no more ..." (who likes frankie goes to hollywood)
Has to be switched off. - Reboot hang.

Tried to switch off Multiprocessor too. - no change.

Packetyzer on the VNCViewer PC is showing TCP-Retransmits and some dcerpc = DCE RPC Response, Fragment: Last, FragLen: 753, Call: 83886828 Ctx: 747 - packets i´ve never seen before.

Doesn´t XP use anymore ICMP and dcerpc instead?

Some fellow sufferers out there with simmilar probs?

Anyone who´s found the sollution?

regards, Klemens

3.3.2008:
tried Zyxel Elite 2864I connected over serial Interface - killed AdminPC (TCPIP stuck, machine hang)
tried today with Eicon Diva 2.01 ST (PCI)

[kletool]

good things are so near!

Found on the Diva Client Software Suite version 3 - CD
an UPDATE directory:

here the README.TXT
Diva ISDN Client for Windows 2000/XP - Updates
=============================================
October 2002

Contents
--------
1. Introduction
2. Diva ISDN USB Fix
3. Diva 2.02 PCI Fix

1. Introduction
----------------------------
This directory contains updates to the release of Software Suite 3.0 for
Diva ISDN Client adapters on Windows 2000 and Windows XP. If you are not
experiencing any difficulties with the product there is no need to apply
these fixes. However, if you are experiencing difficulties which are appear
to correspond with the descriptions given below, then please apply the
appropriate update.

2. Diva ISDN USB Fix
----------------------------
This fix addresses an issue w
ith USB controllers on some machines running
Windows XP which may cause problems during data transfer. This problem
results in connections which appear to be inactive or very slow (especially
when connecting to the Internet).

To install this update please execute the usbfix.exe application in the
'usbfix' directory.


3. Diva 2.02 PCI Fix
----------------------------
This fix addresses a problem which may be encountered when using a Diva
2.02 PCI adapter in a 'fast' machine running Windows 2000 or Windows XP.
Some applications may indicate that there is a problem with the cable, that
layer 1 is down, or that there is no dialtone. For example, the Line Check
program may report that there is a Layer 1 error and that there is a problem
with the cable.

To install this update please execute the 202fix.exe application in the
'202fix' directory.


the only thing i donot understand, how a fragmented TCP communication can kill Win2000 SP4

[YeOldeStonecat]

Couple of things I'd try...

*Latest video driver
*I prefer UltraVNC of the various VNC flavors out there, try with and without the video hook driver
*Latest drivers for your NIC
*Run a TCP/Winsock repair utility http://www.snapfiles.com/reviews/WinSoc ... xpfix.html