I use Talktalk in the Uk and at first when I subscribed it all worked fine, but for the last couple of months I cannot connect.
My friend who lives next door to me is using the same isp with the same speed and he has no problems at all. I tried every avenue you can imagine to see if I could rectify this connection problem but could not resolve it. Eventually my friend put his user name and password into my connection and it worked fine again, so it would seem that they can target individual computers. When I rang them to find out why I could not connect with my user name and password but could using my friends on the very same computer they just pleaded ignorant and gave me a technical helpline number charged at fifty pence a min. Surely this is breaking the agreement of a contract to supply you with a fully operational internet connection?