Why do I keep getting redirected to "/cgi-bin/redirect.ha", when using AT&T U-Verse?

Solution 1:

This is a known bug in the Motorola NVG510 modem supplied by AT&T U-Verse. It has nothing to do with your computer or browser, and it's not a virus or abuse attack:

Basically, when the NVG510 looses connection, rather than giving you an error message it redirects all traffic to "/cgi-bin/redirect.ha". Thus visiting to "www.example.com/whatiwant/" returns a redirect to "/cgi-bin/redirect.ha". The browser is free to cache such data, and may do exactly that. Thus you sort of randomly ended up with "redirect.ha" even after your modem retains connection.

Some details on fixes are at http://earlz.net/view/2013/08/03/2006/nvg510-fixer-an-android-application