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How To Forget Networks On Your Mac


Dave Taylor Posted by

I used to leech Internet access from a neighbor, but after they gave me grief about it, I set up my own wireless network and am paying for my own Internet. Good citizen, right? Problem is, every time I start up my trusty old MacBook it automatically picks my neighbor’s network and I have to explicitly switch it to use my own. Isn’t there some way to fix this annoying wifi network behavior??

Dave’s Answer:

You’re right, you’ve become a good network citizen, and just in time. Cities are starting to establish laws that define leeching off another person’s wireless wifi network without permission as an illegal act of theft. How you’d get caught I don’t know, but you can imagine that from the other party’s point of view, it’d be alarming if you were, say, pirating movies and it was their computer network that was tagged!

Like many other computer systems (think Windows Vista, for example) the Mac OS X system is smart and tries to simplify your life by remembering what you’re doing and automate the process subsequently. Sometimes that’s a pain. :-)

What happened was that you have a setting in your “Network” System Preferences that tells your computer to remember networks you’ve joined and prefer them over new ones that it hasn’t seen before. Since your neighbor’s network is now marked as a “preferred” network, well, you know the problem you’re seeing!

I actually had a similar problem in a hotel room during the Consumer Electronics Show recently, where the first night I was there I used the hotel network “Encore – Rooms – Wireless”, but then set up a wireless router so my roommate and I could share a single connection.

In the pull-down menu from the wifi icon on the menu bar, I saw this:

mac forget wireless wifi network 1

The shortcut to get the right spot to change or forget the preferred wireless network can be reached by choosing “Open Network Preferences…” at the bottom of that menu, which takes you here:

mac forget wireless wifi network 2

Don’t worry about what network it shows you as connected to at this point. You want to click on the “Advanced” button:

mac forget wireless wifi network 3

Now scroll down and find the network in question. It’ll be somewhere on the list:

mac forget wireless wifi network 4

Click on the “-” button and that wifi network is no longer on the preferred list. Also notice that right below it is the option to “Remember networks this computer has joined”: if you want to choose a network each and every time just unselect it.

Done? Just click on the red button on the top left and it’ll ask if you want to save the changes:

mac forget wireless wifi network 5

That’s all there is to it. Good luck, and thanks for not stealing bandwidth. :-)

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About the Author: Dave Taylor is known as an expert on both business and technology issues. Holder of an MSEd and MBA, author of twenty books and founder of four startups, he also runs a marketing company and consults with firms seeking the best approach to working with weblogs and social networks. Dave is an award-winning speaker and frequent guest on radio and podcast programs. AskDaveTaylor.com http://www.intuitive.com/blog/

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