UltraVNC Viewer crashes when UAC screen shows on the server

UltraVNC Viewer crashes when UAC screen shows on the server

Postby pabouk » 2010-11-04 12:20

When UAC (User Account Control) screen shows on the server, viewer crashes (or terminates without any message) immediately and it is not possible to connect again to the server until the UAC screen is handled locally on the server.

Both client and server are 1.0.9.1 on Windows 7 64 bit.
The server uses the hook driver.
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Re: UltraVNC Viewer crashes when UAC screen shows on the ser

Postby Rudi De Vos » 2010-11-04 18:11

This is the normal behaviour when winvnc run as application.
UAC popup show in a secure desktop, winvnc get access refused, and close viewer connection.

Only running as service, you can get access to the UAC popup.
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Re: UltraVNC Viewer crashes when UAC screen shows on the ser

Postby pabouk » 2010-11-05 09:06

Thank you for the explication! I run WinVNC as an application (with escalated privileges) to enable the driver. Then I was wondering why I cannot access UAC screens having suspicion that they used to be accessible.

Should not rather WinVNC send a message to the client saying that it cannot access the screen so the client could show the reason for closing the connection? The current behaviour is very user unfriendly.
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Re: UltraVNC Viewer crashes when UAC screen shows on the ser

Postby Rudi De Vos » 2010-11-05 10:14

You can change this behaviour by starting winvnc with a comman line

-sc_exit

*Server quit when viewer disconnect
*Don't exit when desktop switch to UAC/winlogon

In this case the viewer stay connected ( with a black screen)...and continue after the (local)user has pressed the uac popup.
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