Claude.ai Service Outage: Database I/O Issues Cause Login Problems and Slow Performance
By
zurfer
Crisp on the outside, thoughtful on the inside. A keeper.
Summary
Anthropic's Claude.ai service experienced a significant outage from 14:17 to 17:11 UTC on March 11, 2026, caused by severely degraded I/O performance in the primary application database following routine maintenance. The incident resulted in slow or failed requests on Claude.ai and prevented new or refreshed sign-ins for Claude Code and the Console, though API traffic via the Claude Developer Platform remained unaffected. The company posted a postmortem report detailing the incident and its resolution.
Key quotes
· 4 pulledBetween 14:17 and 17:11 UTC, our primary application database experienced severely degraded I/O performance following a routine maintenance operation
causing slow or failed requests on Claude.ai and preventing new or refreshed sign-ins for Claude Code and the Console
API traffic via Claude Developer Platform was unaffected
Posted Mar 11, 2026 - 17:56 UTC
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