If you cannot reach a particular site on the Internet you should run a NeoTrace to the site before calling your ISP to complain. Most often you will discover that your ISP's network is just fine, but the network your target site is on is actually the one that is down or very slow.
Analyze your network connection and find failure points, determine if it's your ISP, the target site or part of the internet backbone that is at fault. Simply drag a link from your browser and drop it on NeoTrace; all the nodes between your computer and the destination site are displayed in a straightforward, graphical format. If you place your cursor over any node icon, the IP address and round-trip data appear, along with the name and address of the domain's owner.