We have experienced a number of outages today to servers connected to the 217.146.97.x IP Range affecting some shared servers and a couple of customer co-lo servers. These were caused by a DOS attack that overwhelmed our firewall.
We have now taken a number of steps to hopefully mitigate this issue including upgrading the firewall and some network maintenance. So far all appears good but we will be monitoring this for the next day or two to ensure all stays stable.
This issue now appears closed and all is working well