Innocent websites were blocked and labelled phishers on Wednesday following an apparent conflict between OpenDNS and Google's Content Delivery Network (CDN).
OpenDNS - a popular domain name lookup service* - sparked the outage by blocking access to googleapis.com, Google's treasure trove of useful scripts and apps for web developers. According to reports, a flood of errors hit pages that used Google-hosted jQuery and hundreds of thousands of sites fell over.
Visitors to websites were confronted with a message saying: "Phishing site blocked. Phishing is a fraudulent attempt to get you to provide personal information under false pretenses."
Other visitors were greeted with a 404 error, aka the dreaded 'file not found' message.
The fact the issue popped up suddenly on Wednesday would suggest that engineers at Google had been fiddling with SSL certificates or made some other change that conflicted with OpenDNS.