Back to my Mac screen sharing not visible in Finder

I have a MacMini at home which I leave turned on for various reasons. One of them is so that I can access it from work with screen sharing. But I cannot see my MacMini from my Macbook Pro at work.
All of my computers have iCloud Back to my Mac enabled as well as screen sharing. Locally (on the same network) I can see all of my computers but but I don't see it over the internet when I am at work.
Anybody have any ideas?
All computers running OS X 10.10 or 10.10.1.

It's possible that your work network is blocking some of the ports necessary for B2MM to work.
Have you ever tried accessing the Mac mini from a different network outside of your home? If this works, then it's probably specific to your firewall/network settings at work.

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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 leaving my personal MacBook pro at the house and using my office MacBook Pro trying to share the screen. I'm using the assigned vnc://ipaddress to login. What I mean by not working is that I get a message stating that my computer cannot be found. I drive home from the office (I don't do anything to the house computer) and sit in my yard and screen sharing works.
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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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e) You can use LogMeIn.com for screen sharing. No home router issues. However, LogMeIn.com is not as fast. However, it is fairly reliable and easy to get setup.
f) You can Port Forward the screen sharing ports in your and your Mom's home router.
I would like to have control of the mac at home and my Mom's new mac. How screen sharing works when I am at the house is exactly what I need. I see the other MacBook Pro in a window on my MacBook Pro computer and I have full control of the Mac.
You can get full control, you just need to deal with your home router.
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Back to my Mac screen sharing not visible in Finder

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