Cloudflare is down, causing many websites and big platforms to go dark.

The company says it is working to understand the full impact of a problem which potentially "impacts multiple customers."

US company whose services include defending millions of websites against malicious attacks experiences unidentified problem

Cloudflare is down, causing many websites and big platforms to go dark.

“I worry this is the big botnet flexing,” CEO said. But outage was self-inflicted.