VNC enables you to remotely access and control your devices from internal and external networks. It's very helpful when you want to remotely administer a computer. However, there are a few times when you would like to prevent somebody from accessing your computer and/or monitor what you are doing. Luckily, you can block VNC.
Using the local computer firewall. (Windows)
Open Windows Firewall with Advance Security.
Click on Inbound Rules.
Click on New Rule.
Under Rule Type, select Ports. Click on Next.
Select TCP. Then enter the ports used by your VNC. Default is 5900 and 5800.
Select Block Connection. Hit Next all the way to the end of the wizard.
Disable VNC Service
Open Services.MSC.
Look for VNC Server and hit Properties.
Stop the service. You may also select Disable service.
Uninstall Completely
Go to Control Panel > Program and Features.
Uninstall the VNC program..
Disconnect from the Network
Unplug your network cable physically from the computer.
Disable NIC. Go to Control Panel > Network Settings > Right click on your connection > Disable.
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