At approximately 6:05 PM EST, Sol experienced a persistent brute-force attack on multiple web resources from a small collection of IP addresses. Typically, these are picked up and blocked without affecting performance beyond a minor blip as the system identifies and responds to the threat.
A bug was uncovered during IP address matching (grep/egrep pattern distinction) that rendered automatic DoS protection ineffective. The issue has since been resolved and propagated to other servers. As of 6:20 PM EST, the system is considered stable.