Send Ctl Alt Del no effect to login

[diezwei]

Hello,
no effect by klick on the button send Ctl Alt Del to login on Windows. This ist only on clients with a new Windows installation.
Some clients works fine.
We are using Windows 10 1909 and Ultravnc 1.2.50. This problem was also with version 1.2.23.

Is there a solution to fix this?

Greathing
Ralf Reich

[Rudi De Vos]

Running as admin or service ?

[diezwei]

Thanks for replay.
VNC runns as service

[Rudi De Vos]

To enable Software Secure Attention Sequence:

Open the Local Group Policy Editor on the agent machine:
Press

+ r to open the run dialog
type gpedit.msc and press Enter.

Expand Computer Configuration > Administrative Templates > Windows Components

Select Windows Logon Options.

Double-click Disable or enable software Secure Attention Sequence.

Select Enabled.

Select Services from the drop down list in the bottom left pane.

Click OK.

[diezwei]

Thank you for the suggetion. I want to test it, if I have a computer with this error.
This error is not on all computers.