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Why You See 'Free Public WiFi' In So Many Places

Posted by Soulskill on from the deja-vu-all-over-again dept.

An anonymous reader writes "Almost anywhere you go these days (particularly at airports), if you check for available WiFi settings, you have a pretty good chance of seeing an ad hoc network for 'Free Public WiFi.' Of course, since it's ad hoc (computer to computer) it's not actually access to the internet. So why is this in so many places? Turns out it's due to a bug in Windows XP. Apparently, the way XP works is that if it can't find a 'favorite' WiFi hotspot, it automatically sets up the computer to broadcast itself as an ad hoc network point, using the name of the last connection the computer attempted. So... people see 'Free Public WiFi' and they try to log on. Then their own computer starts broadcasting the same thing, because it can't find a network it knows. And, like a virus, the 'Free Public WiFi' that doesn't work lives on and on and on."

3 of 260 comments (clear)

  1. Old news by lavagolemking · · Score: 5, Informative

    Steve Gibson covered this over 3 years ago. https://www.grc.com/sn/sn-082.htm

  2. Re:I see this alot by TrisexualPuppy · · Score: 5, Informative

    The "hpsetup" ESSID is from HP bloatware. It is used to connect the computer to wireless peripherals, namely HP wifi-enable printers.

    I researched this myself, and it ended up that there were a bunch of better ways to implement it, but HP flat out didn't care.

  3. Your machine would have to be years out of date by Anonymous Coward · · Score: 5, Informative

    to be affected. This was fixed in XP SP3. Love lines like "When a computer running an older version of XP ...." without further explanation. Haters gonna hate!