Windows – VNC on windows 7 with administrator rights

networkingvncvncserverwindowswindows 7

I have a weird problem with VNC server (UltraVNC) on windows 7. I can connect to the server with no problems and use it as it should be.

Until.. I try to launch some application with administrator rights (Run as Administrator).

When I do that, a full screen notification appears on the server machine "Are you sure you want to launch it with admin rights bla bla". At the same moment I get disconnected from the server and can't connect until that message times out and disappears by itself.

Is there any way to make it work without disabling that notification messages?

Thanks.

Best Answer

I think the VNC server is disconnecting you because Windows is changing your desktop to the secure desktop. This is when the screen dims and the dialog pops up. I believe this is confusing the VNC server, so it just dies. You can 'fix' this by disabling the secure desktop. On Windows 7, this is easy to do. Simply open UAC settings, and select "do not dim my desktop" (third one from the top).

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VNC – How to Make VNC Faster

VNC has some limitations inherent in the protocol it uses. RFB, remote framebuffer, works by transmitting rectangles of pixels over a network. The higher the resolution and bit depth the more bandwidth required to send updates. There are a few optimizations VNC servers/clients already do:

Only send changed regions, caching unchanged regions on the client.
Copying cached regions on the client when changes do occur.
Various forms of lossless and lossy compression

You can fiddle with the settings on both the client and server to see which settings work best for your internet connection. Any client can connect to any server because they negotiate to determine which protocol features both support but its best to use a client and server from the same company if you want to use more advanced protocol features.

RDP and X protocols transmit drawing instructions instead of patches of pixels. This is why under some conditions they are superior to VNC.

Other proprietary remote access services may use similar techniques but are undocumented. Remote access services do have the benefit of being able to punch through firewalls easier than direct remote access, they are usually easier to configure and have better support for encryption.

I've used VNC, Remote Desktop, LogMeIn Free, PCAnywhere and remote X. Each has its merits:

VNC actually performs better than the other protocols over extremely limited bitrates. (Think dialup connection) And it works on virtually any platform.
Remote Desktop works well over LANs and integrates seamlessly with ActiveDirectory.
LogMeIn is great for accessing Windows PC over the internet and also supports ActiveDirectory integration. It has ActiveX, Java, Firefox extensions and even an HTML based client. The free version allows you to manage up to 5 PCs. Paid versions increase this number, add file transfer and advance management features.
PCAnywhere is similar to VNC and Remote Desktop. It supports various levels of encryption, file transfers and remote configuration. Things you'd have to piece together with VNC and Remote Desktop.
X is the Unix world's equivalent of Remote Desktop. To be fair, it's been around a lot longer than any of the other protocols. It works great over a LAN but is too chatty over the internet. Several projects have attempted to improve this with varying levels of success. NoMachine NX, mentioned already, is one such project.

All of the remote access protocols I've mentioned are freely available (either with an OS or as a download) except PcAnywhere, which is sold by Symantec.

Personally I would try each of them and select the one that best suites your needs.

Windows – VNC single click and UAC on Windows 7

i use a ruby script, packed into an exe with ocra. since it's not regonized as a self extracted zip, windows seven does not prompt for admin password. may sounds complicate, but it is not.

it's realy a good workaround.

plus you can generate yourself your own exe and change setting offline.

how to :

make dir

myexe

unzip ultravnc-sc.exe into

myexe/ultravnc-sc

install ruby : http://rubyinstaller.org/downloads/ (i use 1.8.x branch)

install ocra : on a command line

gem install ocra -r  --http-proxy=http://yourproxy_ifneed

edit ruby script myexe/myexe.rbw :

Dir.chdir File.dirname($0)
exit if defined?(Ocra)
system('ultravnc-sc/winvnc.exe')

build exe : on a command line

cd myexe
ocra --icon ultravnc-sc/icon1.ico myexe.rbw ultravnc-sc/**

test it !

that's all!

Best Answer

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Windows – VNC single click and UAC on Windows 7

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