Blizzard is currently being affected by a DDoS attack which explains why many players in Europe are having difficulty trying to connect and also why some services are not functioning as they should be. The statement from Blizzard reads:
While we are closely monitoring the situation we wanted to thank you for your patience and apologise for any inconvenience this may cause.
The problem first materialised yesterday when Blizzard begun to investigate the problem so it has been on-going for a few hours now. Keep an eye on Twitter updates for progress on the fix. It’s not affected everyone (I can connect but Rush can’t) but if you are experiencing problems the CS tweets should help.
Ashley Stephenson, CEO of Corero Network also dropped an email over to explain what is likely happening.
“While it appears that Blizzard may not be the direct target of these most recent attacks they are reporting to be suffering from collateral damage. This is a common side effect of larger scale DDoS attacks. The shared infrastructure of the Internet, Service Provider or Hosting center are all subject to possible overload when they are forced to carry the malicious attack traffic and this can impact innocent bystanders such as other customers who are downstream of the overloaded resources even though their online services are not explicitly being targeted by the attack traffic. Think of it as an attempt to create an intentional “rush hour” where all commuters suffer. To combat this issue the intermediate providers also need to deploy First Line of Defense DDoS protection services to prevent the traffic jam from occurring in the first place.”