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[GH-ISSUE #733] UAC Causes Remote Desktop to freeze #477

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opened 2026-02-27 15:50:33 +03:00 by kerem · 11 comments

kerem commented

2026-02-27 15:50:33 +03:00

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Originally created by @xuxuedong on GitHub (Dec 9, 2018).
Original GitHub issue: https://github.com/quasar/Quasar/issues/733

stuck when i open task manager on remote desktop
at that moment, the cpu consume is larger than the normal

tested server os: win10_pro_x64_cn
test client os: win8.1_pro_x64_cn

Originally created by @xuxuedong on GitHub (Dec 9, 2018). Original GitHub issue: https://github.com/quasar/Quasar/issues/733 stuck when i open task manager on remote desktop at that moment, the cpu consume is larger than the normal ![qq 20181209092428](https://user-images.githubusercontent.com/9376976/49692371-479cf380-fb94-11e8-9f74-f59d7afd8344.png) tested server os: win10_pro_x64_cn test client os: win8.1_pro_x64_cn

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2026-02-27 15:50:33 +03:00

kerem commented

2026-02-27 15:50:33 +03:00

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@Aholicknight commented on GitHub (Dec 10, 2018):

Could you post your log so we can further help?

@Aholicknight commented on GitHub (Dec 10, 2018): Could you post your log so we can further help?

kerem commented

2026-02-27 15:50:33 +03:00

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@xuxuedong commented on GitHub (Dec 11, 2018):

log? windows event log? there is none log file within the current directory

@xuxuedong commented on GitHub (Dec 11, 2018): log? windows event log? there is none log file within the current directory

kerem commented

2026-02-27 15:50:33 +03:00

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@xuxuedong commented on GitHub (Dec 11, 2018):

as i see, it isn't stuck, the picture is changing, just unresponsible when i click after started task manager

@xuxuedong commented on GitHub (Dec 11, 2018): as i see, it isn't stuck, the picture is changing, just unresponsible when i click after started task manager

kerem commented

2026-02-27 15:50:33 +03:00

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@xuxuedong commented on GitHub (Dec 11, 2018):

but when i tested:
server os: win10_pro_x64_cn
client os: xp_pro_x86_cn
i use remote desktop to operate xp, it's responsible when i click after i started task manager

in addition, i found the cpu consume is normal

@xuxuedong commented on GitHub (Dec 11, 2018): but when i tested: server os: win10_pro_x64_cn client os: xp_pro_x86_cn i use remote desktop to operate xp, it's responsible when i click after i started task manager in addition, i found the cpu consume is normal

kerem commented

2026-02-27 15:50:33 +03:00

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@Aholicknight commented on GitHub (Dec 11, 2018):

So is this issue fixed?

@Aholicknight commented on GitHub (Dec 11, 2018): So is this issue fixed?

kerem commented

2026-02-27 15:50:33 +03:00

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@MaxXor commented on GitHub (Dec 11, 2018):

@trollmad3 No, it's not on Windows 8.1.

@MaxXor commented on GitHub (Dec 11, 2018): @trollmad3 No, it's not on Windows 8.1.

kerem commented

2026-02-27 15:50:33 +03:00

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@Aholicknight commented on GitHub (Dec 11, 2018):

When I get home, I will create a windows 8.1 virtual machine and see if I could do anything to fix this.

@Aholicknight commented on GitHub (Dec 11, 2018): When I get home, I will create a windows 8.1 virtual machine and see if I could do anything to fix this.

kerem commented

2026-02-27 15:50:33 +03:00

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@mystyq commented on GitHub (Dec 11, 2018):

This behavior also occurs when opening chrome browser (temporarily).

@mystyq commented on GitHub (Dec 11, 2018): This behavior also occurs when opening chrome browser (temporarily).

kerem commented

2026-02-27 15:50:33 +03:00

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@mystyq commented on GitHub (Dec 11, 2018):

I believe the problem is related to the mouse_event WinAPI calls. If you run the task manager as administrator it seems to work. mouse_event is deprecated and I wonder if switching to SendInput calls would fix this.

@mystyq commented on GitHub (Dec 11, 2018): I believe the problem is related to the `mouse_event` WinAPI calls. If you run the task manager as administrator it seems to work. `mouse_event` is deprecated and I wonder if switching to `SendInput` calls would fix this.

kerem commented

2026-02-27 15:50:33 +03:00

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@xuxuedong commented on GitHub (Dec 12, 2018):

@mystyq yeah, you are right, i tested the client run as admin on win8.1, it's no problem

@xuxuedong commented on GitHub (Dec 12, 2018): @mystyq yeah, you are right, i tested the client run as admin on win8.1, it's no problem

kerem commented

2026-02-27 15:50:33 +03:00

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@ghost commented on GitHub (Jan 7, 2019):

Adding to mystyq's answer/solution. User32 has plenty of undocumented features for injecting keyboard or mouse input. Even for touch input.

See user32!InjectDeviceInput, user32!InjectGenericHidInput, user32!InjectKeyboardInput, user32!InjectMouseInput, user32!InjectPointerInput, user32!InjectTouchInput

Here's some sample code for Visual Basic .NET github.com/Nukepayload2/Nukepayload2.Diagnostics.InputInjection@00600d8a22/Nukepayload2.Diagnostics.InputInjection/Preview/UnsafeNativeMethods.vb

And I took the time to write a demonstration in C# https://github.com/gigajew/KeyboardInjection

@ghost commented on GitHub (Jan 7, 2019): Adding to mystyq's answer/solution. User32 has plenty of undocumented features for injecting keyboard or mouse input. Even for touch input. See user32!InjectDeviceInput, user32!InjectGenericHidInput, user32!InjectKeyboardInput, user32!InjectMouseInput, user32!InjectPointerInput, user32!InjectTouchInput Here's some sample code for Visual Basic .NET https://github.com/Nukepayload2/Nukepayload2.Diagnostics.InputInjection/blob/00600d8a22e9ea1ba8ef284a0e2c6ed552d9192e/Nukepayload2.Diagnostics.InputInjection/Preview/UnsafeNativeMethods.vb And I took the time to write a demonstration in C# https://github.com/gigajew/KeyboardInjection