> They had two links from their System Flight Server, one for redundancy if one goes down. Both went down at the same time, apparently unprecedented for them.

> They had two links from their System Flight Server, one for redundancy if one goes down. Both went down at the same time, apparently unprecedented for them. What I understood here, is that they were redundant systems, but running the same software, with the same bug present, so both went down. Redundant hardware can only protect you against hardware failures.