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Site generated: 2026-06-05 20:04:21 UTC • 6/5/2026, 8:04:21 PM local
Home / Cloudflare / Incident Details

TLS Connectivity Issues Affecting Subset of Let's Encrypt Certificates

Resolved Unknown Incident
Started
Fri, Jun 5, 2026, 05:28 PM UTC
Last Updated
Fri, Jun 5, 2026, 05:28 PM UTC
Resolved
N/A
This incident has been resolved (Total duration: 2h 36m)

AI-Powered Analysis

Impact Severity
minor
Categories
tls certificates
Affected Users
all-users
Root Cause Analysis
Unsupported CA bundling affecting a subset of Let's Encrypt certificates
Analysis performed by anthropic.claude-3-haiku-20240307-v1:0 on Fri, Jun 5, 2026, 08:02 PM UTC

Incident History

Jun 5, 17:28 UTC
Identified - Cloudflare has identified an issue affecting a subset of Let's Encrypt certificates, in which unsupported CA bundling may result in TLS connectivity issues for some visitors. Customers requiring immediate resolution may order a replacement certificate; re-issuance from the same Certificate Authority will resolve the issue.

Customer action is not required for a permanent fix — Cloudflare engineering is rebuilding all impacted certificate chains, and affected certificates will be automatically restored to a valid state.

Jun 5, 17:22 UTC
Investigating - Cloudflare has identified an issue affecting a subset of Let's Encrypt certificates, in which unsupported CA bundling may result in TLS connectivity issues for some visitors.

External Resources

View on Cloudflare Status Page Back to Cloudflare incidents