UltraVNC Reverse/ Screen Locked

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UltraVNC Reverse/ Screen Locked

Postby zago123 » 2018-01-05 13:11

Hi guys,

i need help,

I'm using ultravnc on my computers, I use it in reverse mode, that is, when I'm on some problem client computer, I have a program that calls the server through the reverse vnc. the server it is in listen mode.

The problem is this, every time I open some application that needs administrator permission the vnc blocks the screen for me and I can not move.

In what options do I change this?

thanks
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Re: UltraVNC Reverse/ Screen Locked

Postby Rudi De Vos » 2018-01-06 16:01

Cause:
UAC block applications with lower permission to send data to higher.
Workaround
1) If winvnc is started with "runas admin" you are able to control the admin apps, but still you are not able to press the UAC prompt on the secure desktop.
2) if winvnc is started as service you are able to control the admin apps and you can access the secure desktop

In most cases 1) will do as the user is in front to help the grant access to admin apps.
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Re: UltraVNC Reverse/ Screen Locked

Postby zago123 » 2018-01-11 12:57

:surprise: UAC low here, and not work, in vnc reverse will have permission problem vnc blocks the screen for e and i can not move.
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Re: UltraVNC Reverse/ Screen Locked

Postby slx » 2018-03-01 14:37

Hello,

I had something like this. In the left upper corner a red windows appears with something like: UltraVVNC running as application does not have permission to acces UAC protected windows
So my windows 10 instance also uses autologin and switch it off is no option.

The solution in my case was:
- open cmd.exe with adminstrator privledges
- start C:\Windows\System32\UserAccountControlSettings.exe
A Window arrises with 4 level. The 3rd is Windows 10 Pro standard. Lower this to 2nd level of the floor.
When you now start vncviewer and you start an application that need elevated rights, the screen is not blacked out with the red Windows in the upper left corner.

So actually I seems this has nothing to do with vnc-server configuration.

Hope this helps,
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