Can't connect to other mac on network

I have three MacBook Pros on my WiFi network - two are late 2011 models running Lion (one is mine and one is my husband's) and a late 2014 model running Yosemite.
I have File Sharing turned on on all three computers and they all have shared folders showing in the panel.
Both Lion computers can connect to my Yosemite computer, the Yosemite computer can connect to my husband's Lion computer, but neither he from his Lion computer nor I from my Yosemite computer can connect to my Lion computer.
Why would that be? I get the message "There was a problem connecting to the server "myOldMac'sName". The server may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and they try again."
But... I can see my Lion computer in the sidebar of a Yosemite finder window, along with my husband's Lion computer and the rest of my Shared devices, but it just won't connect. I have restarted more than once.
Any ideas anyone?

Hello Powermac82, and a warm welcome to the forums!
Are the first 3 numbers of the IP of this one the same as the first 3 numbers of the others?

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