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This posting is provided "AS IS" with no warranties, and confers no rights. The opinions expressed within are my own and should not be attributed to any other Individual, Company or the one I work for. I just happen to be a classic techie who is passionate about getting things to work as they should do (and are sometimes advertised and marketed as being able to?) and when I can I drop notes here to help others falling in to the same traps that I have fallen in to. If this has helped then please pass it on - if you feel that I have commented in error or disagree then please feel free to discuss with me either publically or privately? Cheers, Dave
Thin Clients, VDI and Linux integration from the front lines.... Raw and sometimes unedited notes based on my experiences with VMware, Thin Clients, Linux etc.


Went to a customer’s the other day for what should have been a simple health check, and it turns out that their 25 odd Citrix Server Farm has recently been experiencing a problem whereby the Production Servers will routinely exhibit a BSOD (Blue Screen of Death) and spontaneously reboot.

As the servers were already set up to save a Mini Dump file and then reboot, this has somewhat kept the issue “liveable” with, but for some reason this wasn’t on their most important list until I’d actually walked through the door, just as one of them was finishing rebooting at 8.50am.

I went through all the servers and collated the Mini Dumps to find enough similarities (almost identical 60 odd instances over the last 3 months or more?) to identify the offending component(s) and leave a general pointer as to what might have been the cause (in this case Video Driver VDTW30.DLL).

After a through review of the first half dozen mini dumps it was clear that the specific issue has already been resolved by Citrix with Hotfix XE104W2K004 (dated Mar 7 2005), and what I find somewhat intriguing is that this Hotfix is intended to be applied to a Windows 2000 Server with Citrix SP4 applied AND yet PreDates it? How is that possible I wonder?


Servers on which SpeedScreen Browser Acceleration was enabled would unexpectedly restart at periodic intervals with memory dumps indicating the vdtw30.dll video driver to be at fault. The issue occurred due to improper error handling when older clients, which do not support ThinWire2 mode, were connected to the servers in ThinWire1 mode.
This hotfix corrects the issue.


Posted on Wednesday, June 29, 2005 12:33 AM Citrix | Back to top

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