As many of our user's have noticed service has been less than good the last few days. This was caused by a DDoS attack. We have managed to get control of the situation by notifying hosting providers and blocked several thousand IP addresses in several dozen class C networks.
The main Russian ISP that the attacks were coming from is Yandex LLC. When we blocked the attackers IP address or an entire class C network, within minutes the attacker would be using a different address in a completely different class C network. After doing this song and dance for several hours, we realized that it was mostly coming from Yandex and sent off an e-mail to their abuse address. We haven't received a response from them, so we took drastic action and blocked every IP address owned by Yandex. After blocking Yandex, everything seems to have returned to normal. If you are a user in our pool coming from this network, please PM me your IP address and I will white-list it.
We'd like to apologize to our users for the inconvenience of this attack. We're keeping a close eye on logs and traffic analyzers to monitor for any new attacks so we can block them before they disrupt the pool any further.
Thank you for your understanding and tolerance for the situation, we appreciate it.