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Screen Share over the Internet

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joseph wilkins
Screen Share over the Internet
on Jun 14, 2010 at 6:29:22 pm

So I want to screen share my work computer from my home computer.

I have Snow Leopard and have set up so I can screen share on the local network... but when I try connecting from home using the work computers' IP address I get an error and it wont let me.

Is this possible?


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Jeff Carpenter
Re: Screen Share over the Internet
on Jun 14, 2010 at 9:26:22 pm

The easiest way I know to do this is to have a MobileMe account. It has a feature called 'Back to my Mac' that is made to make this work easily.

It may be possbile without a MM account, but I'm not a network engineer so I'd have no idea on where to begin on that quest. All I know is that I have MobileMe and it works. (Your home router plays a part in this as well, some work with it and others don't. I own an Apple router so it's not a problem for me, but I know it won't work at my parent's house with their Verizon-loaned router. So google up 'Back to my Mac' troubleshooting tips and see if you can learn anything there before you pay for anything.)

MobileMe does cost money, but be sure to get it from There are people selling it there for less than the $99 list price. Usually because it's last year's box, but the code is still just as good as any new box. You can usually save a few bucks that way.

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Curtis Thompson
Re: Screen Share over the Internet
on Jun 14, 2010 at 9:48:29 pm


did you also check what port the traffic is going over? i'd bet that your home router is blocking the ports from the outside world that are used...see this article for reference:


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Peter Kennedy
Re: Screen Share over the Internet
on Jun 22, 2010 at 5:36:05 pm

what kind of error message are you getting?

make sure you follow the guidelines here:

note: your router either has to support NAT-PMP or UPnP

following ports have to be enabled:
TCP 443 (signing into MobileMe and enabling Back to My Mac)
UDP 4500 (for connections between machines)

Back To My Mac has been hit or miss for me... just been easier for me use VNC/ScreenShare (with a SSH tunnel).


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Dustin Lau
Re: Screen Share over the Internet
on Aug 12, 2010 at 10:07:40 am

I wrote this article for Leopard and I'm aware there are some differences regarding the built in screensharing app in Snow Leopard. but the hamachi setup should be the same and that is what you need to help establish connections between your remote computers.

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