One, at 3 a.m. on 502, it's not just a "system crash"
On January 29th at 03:17 in the morning, the main domain name resolution of IPIDEA failed; before 05:00, all 13 brands including IP2World, 922Proxy, Luna, and PIA S5 all returned a 502 error. Everyone thought it was a CDN failure, until...