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Last week, while I was at work, a clerk from the IPTV carrier came home to fix a problem with the cable tv service. Upon arriving home, I noticed how he changed my wireless security's username and password. I thought he simply did this to bypass not having me around.

Upon further inspection, I noticed how he also changed my security from WPA2 to gasp basic WPA (!).

What logical reason could there be behind this?

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up vote 2 down vote accepted

It's possible that he needed to connect some sort of equipment that only supports WPA. Do the service personnel from your carrier normally carry some kind of handheld computer for billing/logging? Some older handheld POS systems may not allow WPA2. That said, generally these systems use a cellular connection rather than WiFi so that they'll work anywhere with no fuss. Possibly the tech had a laptop that only supported WPA, although this is very rare in the real world now.

I find it far more likely that the tech needed to hard reset the router for some reason (probably just to diagnose a problem), and when she set it back up for you she just didn't know/didn't care about the difference between WPA and WPA2. As long as all your equipment is modern there should be no problem changing it back. The original-generation Nintendo DS is the only thing I've dealt with in a while that couldn't handle WPA2 (and it goes all out, supporting WEP only).

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The reason could be that Windows XP doesn't support WPA2 without a patch from Microsoft.

Maybe he brought a computer running under this OS and tried to connect to your AP using it.

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