Citrix NT4 sp6 terminal services blue screen

This is my first post on Experts Exchange, i hope someone will be able to shed some light or help me in correcting the problem i am faced with.

there does not seem to be a "citrix topic forum" so i will post it here as this is the closest.

I am running 2 Citrix NT4 terminal service servers  "server 1" and "server 2"

at random times through out the day/week either  server will blue screen with the error

[quote] *** STOP: 0x00000050 (0xa4046000, 0x00000001, 0x00000000, 0xc0290118)

CPUID:Genuine Intel 6.b.1 irql:1e   SYSVER 0xf0000565

here is a picture of the error and the processes running at the time
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This first started to occur roughly 6 months since, we had the 2 servers wipped and re-install and had 4 1/2 months with no problems, in the last 6 weeks the BSOD's have started to re-occur with more and more regularity.

everywhere i read about the error it is linked to either faulty memory (strange to happen on both servers) or 3rd party printer driver problems (this seems more likely, but we had a period of 4 months with no problems using the same drivers now as then)

firstly has anyone been affected by or know of this problem ?

Secondly does anyone have a fix, or possible suggestions to what could be causing it?
Who is Participating?
LucFConnect With a Mentor EMEA Server EngineerCommented:
Hi mxjxsx,


What microsoft has to say about it:

Requested data was not in memory. An invalid system memory address was referenced. Defective memory (including main memory, L2 RAM cache, video RAM) or incompatible software (including remote control and antivirus software) might cause this Stop message, as may other hardware problems (e.g., incorrect SCSI termination or a flawed PCI card). Use the General Troubleshooting of STOP Messages (

Possible Resolutions to STOP 0x0A, 0x01E, and 0x50 Errors

Could be caused by bad memmory:


mxjxsxAuthor Commented:
I will try the memory test on both servers tonight, but i have a strong feeling that is not the cause.  The fact that both servers crash and the 4 1/2 months with no problems leads me to believe it may be a 3rd part driver.

how exactly do i disable 3rd party drivers, and even if i did the results would probably not be conclusive unless i was to run without the 3rd party drivers for several weeks.

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