I expect this happened on Blueyonders server, that they lost the entry for the tradedoubler domain. Anyone viewing your page would see things hang when the browser tried to request the ad from tradeboubler, as it wouldn’t be be able to resolve tradedoubler.com and so the browser would wait for the DNS timeout before it could continue loading the page.

I had exactly the same problem with A4U last week, with the pages hanging for about 2 – 3 minutes before they would load. Doing a view source showed that it stopped at the ad banner at the top of the page. Pinging the domain of the ad server on my PC revealed that my ISP had lost the domains entry, and so it couldn’t be resolved and the hanging was down to waiting for the timeout to kick in. This was solved by manually adding the IP address and domain in my windows hosts file, so it could be resolved locally, and straight away the pages loaded near instantly again. Had nothing to do with A4u, nothing was wrong at their end, it was an issue with my ISP’s DNS server. Unfortunately this does happen occassionally!