CC4 Connect OnPrem (2016) Windows 10 (202h) black screen login issue

[Aarbron]

Hi all,

 

I've encountered a very frustrating issue with student logins on our CC4 Connect OnPrem (Server 2016) network.

 

All clients are Windows 10 64bit 202H (October 2020) CC4 builds.

 

We seem to suddenly have an issue where a student logs in and it just sits at a black screen during the login process. It doesn't happen for staff.

 

Staff and students use UEV profiles.

 

I've had a look on RMs knowledge base but there doesn't seem to be much in relation to this issue.

 

I've tried the following:

 

1. Side by side comparison of two workstations, both same make and model with the same Windows Updates applied - one will work the other won't

2. Fully updating one of the affected machines - Windows and driver updates. No luck

3. Restarting the RM Host service on the affected workstation. No luck

4. Bouncing the domain controllers. No luck

5. Recreating a test student account. No luck

 

Rebuilding a computer by fully removing it from the RMMC seems to work. However, this solution is unfeasible since we have 500+ workstations on the network.

 

Has anyone come across this frustrating issue before? I'm leaning towards some funky permissions issue, since it works with a staff account.

 

Thanks all.

[hallb15]

Yes, I had similar. Standard users get just a black screen after entering their logon details but an admin user can login fine.

It turned out to be corrupt default profile.

 

Here's the solution that fixed it for me - hopefully yours will be the same...

 

Login as an admin account

In Control Panel > Folder Options > View tab > uncheck "Hide protected operating system files" > Apply

- In File Explorer go to C:\Users\administrator\AppData\Local\Microsoft\Windows\

- Right click on the WebCache folder and choose Properties

- Choose the Security tab, take ownership of the folder and all child objects if need be, then give the folder and all child objects "Everyone" full privileges.

 

Remove the cached profile registry entry from HKLM/Software/Microsoft/WindowsNT/ProfileList/xxxxxx (you will need to click on each registry key to show the cached user names)

Remove the C:\users\xxxxxxx folder

Restart and log back in to correctly recreate the new profile.

[Aarbron]

Hi hallb15,

 

Unfortunately, this didn't work.

 

Weirdly, our test.student account logs in fine on some machines but not on others. If the black screen issue occurs for one student user, it then seems to affect all student users who log onto said machine.

 

Regards

Jonathan

[BOOT]

Compare the file permissions on these folders:

C:\ProgramData

C:\Program Files\WindowsApps

C:\Windows\SystemApps

 

They should be the same as in a vanilla Windows 10 install.

 

You can reset them to defaults using icacls

- example:

icacls "C:\Program Files\WindowsApps" /reset /t /c /l

[Aarbron]

Hi Boot3988

 

Unfortunately, that didn't work.

 

We rebuilt a number of computers which weren't working (fingers crossed) they're working again.

 

Having said that, we've just had a call to say one of the rebuilt PCs is now black screening when a student logs in!

 

I might have to contact RM because I'm out of ideas.

 

regards

Jonathan