How do I prevent my Mac from switching Wifi connections when at home?

I have a MacBook Pro, running Mac 10.9.5. I connect wirelessly to the Internet through my home Cisco LinkSys E900 router, which sits just 10 feet away from my computer. However, frequently when I leave my computer inactive for a period of time and then return after waking it from hibernation, my Internet is connect to an xfiniti Wifi hotspot, without my having done anything. How do I configure my Mac so that it will ignore the xfiniti Wifi hot spot and remain connected to my home network?

Solution 1:

Looks like the computer is set to prefer or prioritise the xfiniti Wifi hotspot over you home wifi, you can set your home Wifi to be of priority to any other Wifi connection and this is how to do that,

System Preferences/Network/ then select Wifi and click on Advanced, you'll see all preferred networks there.

Click and drag your home Wifi to the top.

Solution 2:

There is actually more to this story than most of the answers here get into. I tried moving my office network to the top of the list, and my mac still always chose xfinity whenever there was one around.

At one point when trying to connect to xfinity on purpose, during the connection process it told me that it had to "upgrade xfinity connection" or something like that. It claimed it was in the name of security. What it did when I agreed to it was to install a "Profile." This created a new preference panel in System Preferences that was grouped along with Users & Groups and Startup Disk.

In this panel, there was only one option, Xfinity, and some text telling me yay how great it was. After removing this, my mac now honors the order of wifi networks in my Network Preferences.