Comment 19 for bug 81057

The other option I should have mentioned is that manually putting the IP addresses of good DNS servers directly into your router often fixes the problem (usually by unticking / unticking a box like "use ISP's DNS Servers / use Manual DNS servers".

The reason I did not use this approach for my machines is that I usually have no access to log into my clients DSL router, so I needed a solution that would work on the client PC.

Mac
NZ