This morning (utc-5) there were several global outages. Most indicators show them resolved. I’m seeing the same “Bad Gateway” issues on OpenWRT sites.
Maybe the correct phrasing is there were multiple outages globally. Both Vodafone and Level 3 reported outages to clients. Many smaller ISPs did as well that are probably dependent those two. Remember that Down Detector works based on user reports and sometimes those affected have no way to report a problem because … no Internet.
Sorry folks -- our outage (~20min) was caused by me unsuccessfully trying to fix a front-end configuration issue. It was supposed to be a simple service restart but it wasn't. I promise not to do this again in the middle of the day.