Apr 08, 2021

Hi all, maybe it's not the right platform here to discuss about a strange behaviour after sysprep generalize was running.
It's about Windows 10 20H2. Everything runs perfect till I run sysprep. Sysprep is telling me that almost everything is done and the system has to reboot. So after that I will reach the login screen.
After I login the screen shows a few command windows which then disappears but the screen stays black and it seems that windows explorer is looping. It looks like a screen flickering. The only thing I can do is to send a CAD and start Task manager. I can stop windows explorer and the flickering stops to. But I'm unable to start it again.
I tried this with b2001 and b2002 version. Same behaviour. Has someone of you seen this before? What can I do?

Apr 07, 2021


We use vmware osot for Persistent and Non-Persistent vdesktops, but we see problems with time synchronisation. Some time-sensitive applications do not work properly. I am searching which modification of osot is responsible for this, but I have not been able to find it yet.


- Main problem: Windows Time service is not running. On startup the trigger does not work. (Can be started manually)
- When you open Date Time Settings, it seems that the time immediately changes to the correct time.
- Scheduled task "SynchronizeTime" is not executed periodically.
- Scheduled task "SynchronizeTimeZone" is not executed periodically.

Any suggestions?

Apr 09, 2021

It took me some time, but I found the cause of the time synchronisation problems. Via reverse enginering of the osot tool settings it turns out to be the following setting :

"Disable UBPM Autologger".

Do not disable this. I am surprised that few users of the osot tool did not have problems with this.

I also have a feature request : A validated template for persistent vdesktops. I am using my own heavily customized xml template, but still remain a bit unsure of some settings.

Mar 31, 2021


First, thank you for your tool.

A problem occurred while using one.
After Windows 10 is installed, you have entered the audit mode with CTRL+SHIFT+F3 on the 2nd stage installation screen and completed the master image work. Then I ran Generalize, and the language of the desktop icons (explorers, shortcuts) in the user profile was changed to English.
Until Generalize was turned on, it was well written in Korean, but after Generalize, only the above items were changed to English, and the rest were well displayed in Korean.

To test this, the first VM finished up to the second step of the user account when installing Windows, and worked with the created user account instead of the Administrator. At this time, there was no language change even after running Generalize.

Can you tell if it's a Windows problem or a tool?

Apr 08, 2021

Hi, the unattend.xml of OSOT does not work. Create your own file and copy it to the sysprep folder. but be aware that if you start generalize OSOT copies its own unattend.xml. So after starting generalize go immediately to the sysprep folder, delete OSOT's unattend.xml and place your own there.

CopyProfile in the file is at the wrong place. Therefore it's not working. There is a bug opened.

Mar 23, 2021
Mar 26, 2021

Hi Richard,

this was discussed in the Bug #138 (https://flings.vmware.com/vmware-os-optimization-tool/bugs/1203) and Graeme replied that this caused a longer logon time.
Can you confirm this? It would be great if you can share your experience with it.
I have Pools with logon time around 12 seconds with the default generalize settings but with the problem (like you have) that the settings in this default profile aren't copied to all other users profile. But I solved that problems all with the help of DEM.

Best regards, Tom