Elevated TCP three-way handshake failures on api.anthropic.com

lowAnthropicMar 6, 2026 15:34Duration: 48m

networkapicertificate

Network / RoutingCertificate IssueAPI Issue

Summary

This incident has been resolved.

Impact

minor

Timeline

Mar 6, 2026 15:34

[investigating] Some API requests to api.anthropic.com are experiencing connection timeouts due to network degradation at an upstream peering point. Requests that successfully connect are unaffected. We are working with our upstream providers to resolve the issue.

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+27m

Mar 6, 2026 16:01

[monitoring] A fix has been implemented and we are monitoring the results.

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+21m

Mar 6, 2026 16:23

[resolved] This incident has been resolved.

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Lessons Learned

⚠Anthropic has experienced 33 incidents in the past year. This frequency suggests systemic reliability challenges that may warrant additional monitoring.

📊Incidents related to network, api, certificate have occurred 218 times across all providers in the past year. This is one of the most common failure categories in cloud infrastructure.

💡This incident is categorized as: Network / Routing, Certificate Issue, API Issue. Consider implementing preventive measures specific to this failure category.