Screen Sharing not working continuously in Mountain Lion

For some reason, I cannot get Screen Sharing to work continuously. I could not get it to work at all (even though I veried the settings were correct), and after reading some posts here, I rebooted my MacBook Pro and voila! it worked - at least on my home network. However, once I get to work, I can no longer connect.
Any ideas?

And how are you trying to connect with your home Mac from work?
Are you using Apple's iCloud Back-to-My-Mac (BTMM) feature? It should handle getting through home routers?
Does you work have a Firewall and proxy servers in place? They are going to block any attempt at accessing the outside world except via corporate approved networking channels, which frequently do not include Screen Sharing. If this is the case, I might suggest TeamViewer.com as it has an option for setting a Proxy and if the company has not disabled accessing the TeamViewer.com URL, it might work.
If no corporate firewall and proxy server, and you are not using BTMM, then do you have a home router? Did you setup port forwarding for port 5900 from the internet to your home Mac? <http://portforwarding.com>
What address are you trying to connect with? I you have home router you need to use the IP address assigned by your ISP to your home router. If you do a Google search for "what is my ip address", Google will tell you your Public IP address. You need this for your home router.
BTMM and TeamViewer.com avoid the need to know your Public IP, and port forwarding. Corporate firewalls are a beast of their own, and have to be handled on a case by case basis. Some will let you get through, some will not.
If you find you are going to be using the Public IP address of your home router, then you want to get a free dynamic DNS name for you home Mac from No-IP.com or DynDNS.org and then run the dynamic DNS updating utility provided by the dynamic DNS service on your home Mac to keep the dynamic DNS name updated each time your IPS changes your public IP address.

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I have screen sharing turned on and it works fine when I'm in the house in front of the computer on the same network, but when I'm at the office trying to share the screen it is not working. I'm I doing anything wrong?
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I'm talking my Mom, who lives in Louisiana, into buying a Mac and I told her I could help in Arkansas by screen sharing. So, is Port Forwarding a default feature on most routers?
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Screen Sharing not working continuously in Mountain Lion

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