Unable to connect to Mac Air after Yosemite

I have been unable to connect to my Mac Air from my network.  I can connect to the network from the Mac but not from the other network units to the Mac.  Any Ideas?
Thanks,
H

Hi henryleicester,
Welcome to the Apple Support Communities!
It sounds like you are trying to use the Back to My Mac feature. If you are not able to connect using Back to My Mac please use the troubleshooting steps provided in the attached article. 
If you have issues using Back to My Mac - Apple Support
Best regards,
Joe

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