How to Control a PC with a Mac Using VNC for Free

I wrote this back in 2009 but I have reposted it upon request. I hope it is helpful.

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Do you want to remotely control a PC with a Mac? There are many commercial software packages and online services available. However, viagra sale most of them are simply re-brandings of the open source VNC remote control system. Plus, click you may find their performance to be lacking. I’ve been using VNC between Windows, click Mac and Linux systems for a long time. With the resurgence in Mac interest, a lot of people ask me how they can access their existing Windows PC from their new Mac. Here is a quick and easy guide to getting a remote control system up and running using VNC. And by the way, its free.

VNC (Virtual Network Computing) was originally developed in Cambridge, U.K., by developers at the AT&T/Olivetti Research Laboratory. It is a high performance remote control system that includes two software components. The remote computer has the “server” component running, while the other computer runs the “client” component and connects to the remote computer.

(For all you Linux and Unix users,  this guide applies to you as well, but note that most Linux and Unix distributions come with VNC already installed. On those systems, you may need to configure VNC and then issue a “vncserver” command.)

1. Getting VNC “server” running on your Windows PC

First, download the free edition of RealVNC onto your Windows PC. (Note that Vista users may have trouble with the free version and if so, they can install TightVNC. Some people prefer TightVNC for all versions of Windows, but because it has several advanced features it may be a little more confusing for first-time VNC users.)

Next, install your VNC software and specifically choose to install the server component, register the service, and start the service. Now VNC server should be running on your Windows PC. You can set the password for remote access if you like. You should see a small  icon at the bottom right of your screen. By resting on the icon, you should see your computer’s network IP address on your LAN. Make a note of it!

Finally, you need to either disable the Windows firewall on your PC or else open ports 5900 and 5800 in the Windows firewall. If you are opening ports, I recommend that you open 5901 and 5801 also.

2. Getting VNC “client” running on your Mac

There are 3 easy ways to do this.

Option 1: Mac OS X comes installed with a “screen sharing” application that has VNC client functionality. It is part of Apple’s iChat system. However, you can get right into it (without using iChat) by going to the Finder and selecting Go -> Connect to Server… You will then want to enter the IP address of the remote machine with a prefix of “vnc://”. For example,  if your remote PC is, you would enter vnc://

Option 2: There are a few VNC clients made for the Mac. Chicken of the VNC by Jason Harris is probably the most popular. It runs on both Tiger and Leopard. Chicken of the VNC is a free download. Simply install Chiken of the VNC and enter your remote PC’s IP address.

Option 3My favorite way to connect to a remote PC is to simply use my web browser. Both RealVNC and TightVNC include a mini web server with a Java applet for really easy connections. On your Mac, open your web browser (Safari or Firefox) and go to the IP address of your remote PC with “:5800? appended. For example, if your remote PC os, you would enter a URL of and the Java applet will automatically run in your browser. I have often found that this option offers the best performance.

 3. Making your VNC connection secure


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If you are using VNC over your own LAN, you probably don’t have any security concerns. However, if you want to run VNC over the internet (say from one office to another, or from home to work or vice versa), you need to be concerned with security. You should not simply open or forward VNC ports on your router or internet firewall. First, make a secure connection to the remote network using a VPN (Virtual Private Network) connection. Depending on your router and firewall configuration at the remote network, you can make a connection from your Mac using PPTP or IPSEC and once the tunnel is live, you can simply run your VNC through that tunnel. (For Linux and Unix users, you can also tunnel VNC inside of an SSH connection.)

VNC makes it easy to control a Windows PC from a Mac. Its fast, free, and its a thrill to remotely move a Windows mouse pointer, especially the first time. There are a lot of other VNC configuration settings that I didn’t cover, but this should help you get up and running quickly. 

Lastly, their are VNC apps in the Apple AppStore and also various VNC apps for Android phones and tablets as well.