DDoS Attack on DoubleClick Slows Many Sites

DoubleClick says its banner ad network was disrupted today by a distributed denial of service (DDoS) attack on its domain name servers. As DoubleClick's DNS servers became unreachable, the attack had a ripple effect, leaving many of the network's 900 client sites unable to retrieve banners from DoubleClick's ad servers. The company said the attack lasted about four hours and caused "severe disruptions" for customers. Continue reading

RSS Traffic Burdens Publisher’s Servers

The popularity of RSS feeds is testing the web infrastructure of at least one publisher, which likens the impact of newsreader traffic to a denial of service (DoS) attack.

Infoworld.com experiences a "massive surge of RSS newsreader activity at the top of every hour," according to Chad Dickerson, the CTO of Infoworld. "If I didn’t know how RSS worked, I would think we were being slammed by a bunch of zombies sitting on compromised home PCs," Dickerson writes. "Our hourly RSS surge has all the characteristics of a distributed DoS attack, and although the requests are legitimate and small, the sheer number of requests in that short time period creates some aggravating scaling issues."

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UK Betting Sites Hit By Outages

Onling gambling sites Eurobet and Coral have been experiencing ongoing outages since early Monday, shortly after the completion of the Euro 2004 soccer championship and the Wimbledon tennis finals.

Online betting sites have been repeatedly targeted by extortionists employing electronic attacks, including a series of distributed denial of service (DDoS) attacks at the outset of the Euro 2004 event.

Coral site performance

Netcraft is monitoring the performance of twenty leading UK Internet Gambling Sites, with dynamically updating graphs available here.

Most Reliable Hosting Providers during June

Ranking by Failed Requests and Connection time,
June 1st - 30th 2004


During June all of the hosters monitored experienced an outage. Seeweb, an Italian hosting company, was once again the most reliable hoster, taking first place two months in a row. Second placed was the Pair Networks site.

This month the operating systems of the top 10 hosters was very mixed and varied, with three running Linux, three FreeBSD, two Windows (Myhosting.com on Windows 2003 and ExpressTechnologies on Windows 2000), one Solaris and one OpenBSD.

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RIAA Site Still Battling MyDoom.F

On the 17th of each month, computers still infected with MyDoom.F launch a distributed denial of service (DDoS) attack on the web sites of Microsoft and the Recording Industry Association of America (RIAA). While the well-defended Microsoft site has suffered nary a blip from MyDoom.F, the RIAA site was offline from March 17-24 and again last month.

The RIAA site began experiencing performance problems again this morning, although it seems to be faring somewhat better than on previous MyDoom.F trigger dates. The site index is using a text-only redirection page at www.riaa.com in an attempt to reduce the load on its server.

RIAA Web Site Availability

A dynamically updating graph of the sites targeted for DDoS by various MyDoom variants is available here.

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DDoS Attack Cited in Akamai Outage

Akamai is confirming that network outages this morning were caused by a distributed denial of service (DDoS) attack that affected its DNS management system.

The performance problems affected Microsoft, Google, Yahoo and antivirus update services from Symantec and TrendMicro, which are among Akamai's 1,100 customers. Some of the largest affected sites were able to switch their DNS settings to their internal network, rather than akadns.net, which handles domain name service management for Akamai customers. The akadns.net system routs requests for high-volume customer web pages to content stored on its network of distributed servers, easing traffic to the client's main server and speeding delivery to the end user. Akamai performs similar function for downloads of audio and video files, software patches and antivirus definitions.

The outages mark the second disruption of Akamai's network in less than a month, following a similar incident May 24.