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T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooting
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Intern
Intern
Posts: 36
Member Since: ‎03-23-2012
Message 11 of 23 (4,217 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

That's correct. If it's locked it should display a green lock. It is highly recommended to enable the write filter since OS writes to the disk intensively (cached, temporary files, etc...).  All flash drives life are limited by the number of writes to the drive. The best flash drive (depending on the chip it uses) might allow up to 100,000 writes before it starts to fail. This is also true for USB flash drive.

Tutor
Posts: 10
Member Since: ‎06-25-2013
Message 12 of 23 (4,197 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

I'm new to Thin Clients,  if is enable write cache (green) do the users lose the ability to save/modify settings?

 

(they are being used in a library, and require the use of notepad with a barcode scanner.  They need to be able to save files)

 

I guess my question is, what does Enabling Write Filter do?

Intern
Intern
Posts: 36
Member Since: ‎03-23-2012
Message 13 of 23 (4,193 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

Write Filter is a very useful tool that distinguished Windows Embedded from regular Windows OS. It acts as a protective tool that prevent any changes to the system without a user commit. Not only it prevents excessive writes on the drive, it also prevent the system modified by virus or un-authorized user. It stores all the changes in the RAM (not the flash drive) until the system is rebooted (changes are discarded) or the changes are committed to the flash drive.

 

Even with Write Filter enabled, user should still be able to save data to the local drive. However, the file will be gone if the system is rebooted without committing it first. USB drive on the other hand is not affected by write filter. So, any changes or file copy is going to be written on the USB drive immediately.

 

Teacher
Posts: 70
Member Since: ‎07-22-2012
Message 14 of 23 (4,174 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

Hi guys,

I would hope that it was impossible to "wear out" a flash unit after six months, but running a thin client with the write filter off is bad practice. The write filter is designed to be off for a short period of time while the unit is configured and then turn on and left on.

 

The %temp% variable points to the Z:\ drive witch on older images (V252 and before) is 32 MB but on current images is 128 MB. If you have large temp files being created in the %temp% directory, that may be filling the Z: drive. Being a RAM disk, it is cleared on reboot. 

 

 

A Thin Client management product like HPDM should be used to deploy an image to the device, or my personal favorite, just a bunch of settings to a virgin factory image and then lock the write filer.

 

 

I strongly suggest you reimage the device with HP Factory V286 WES7 image, configure and lock the write filter.

 

If the user needs to save files, use a USB, maybe a small hidden one on the back of the unit and setup notepad to save to that device.

 

If the user needs temporary write space, use the Z: drive as it gets cleared every reboot.

 

A thin client is a special device, it is not designed to be operated or used as a PC.

 

A thin client used as a pc will give a slow user experience and troublesome management.

 

A thin client configured and used as a thin client will last many years, never loose its configuration and never loose performance from clutter and junk that builds up on a normal PC.

 

 

Regards

Andrew S

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Tutor
Posts: 21
Member Since: ‎01-09-2013
Message 15 of 23 (4,056 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

I have the write filter off on all Thin Clients. Maybe that's the casuse of the error 0x000000F4 (0x00000003, etc).

 

But I still have the very big problem of the frozen desktop when they reboot..

Teacher
Posts: 70
Member Since: ‎07-22-2012
Message 16 of 23 (4,049 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

Isdera,

Please turn the write filter on and see if the issue goes away. I suspect it will.

 

Running a WES7 based Thin client in production with the write filter off is not supportable or advisable. It also slows the device down and greatly reduces security.

 

Regards

Andrew S

Tutor
Posts: 21
Member Since: ‎01-09-2013
Message 17 of 23 (3,796 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

Nobody else has the problem of the frozen Desktop?

 

We have nearly 200 Thin Clients and we have problems every day with this issue.

 

Even with the write filter on, this happens. I have modified the registry to automatically log on as Administrator:

 

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"DefaultUserName"="Administrator"
"DefaultPassword"="password"

 

I thought the proglem was this, so I removed it and used HP Logon Manager.

 

But I still have this problem.. Can anybody help?

Thank you.

Teacher
Posts: 70
Member Since: ‎07-22-2012
Message 18 of 23 (3,776 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

Isdera,

I am involved in 1,000's of T610s and none have this blue screen issue you are seeing.

 

I strongly suggest you go back to HP Factory image. V290 is current.

 

What is the T610 used for? Citrix XenApp?

 

Configure the device how you want it. Don't allow users to have access to to the device as Administrator, you should be able to configure the device to access the required programs local or better, remove Virtual Desktop environments from "User".

 

Warranty lengths vary by country but you have up to 3 years replacement warranty with the device. Please use this support that is included with the purchase price of the device.

 

I am sure it is something specific to your environment if you are seeing instability.

 

Regards

Andrew S

Tutor
Posts: 21
Member Since: ‎01-09-2013
Message 19 of 23 (3,504 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when rebooti

The image I think is the lastest. I used the one that was included on the last T610 we bought.

 

It simply starts Internet Explorer and conects to the Server to show contents.

 

Now I'm not sure if it gets frozen when shutdown or when log on, but I can't find any solutions to this big problem...

Teacher
Posts: 70
Member Since: ‎07-22-2012
Message 20 of 23 (3,494 Views)

Re: T610 Thin Client gets desktop frozen and blue screens (0xC000021A) and (0x000000F4) when reboot

Isdera,

 

If I understand you correct, the device is autologon to Administrator account? This is not normal and I strongly suggest you change this to the built in User account.

 

Can you please check the www.hp.com/support web site, look for the T610 and download the current image. It should be V290. Versions V252 and before had 32 MB Z: drive which is where temp files get stored. Depending what you are doing, maybe the Z: drive is filling up and this is causing your issues.

 

Also - PLEASE log a support case. The device has a long warranty and you should use it. They should also be able to help you troubleshoot the issue deeper than we can on a public forum.

 

Regards

Andrew S.

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