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Regulatory and protocol clock Standard or protocol · International

Let's Encrypt certificates no longer valid for client authentication

Client authentication EKU removed from all certificates on 13 May 2026, 5 months ago.

13 May 2026 5 months ago Already applies

Let's Encrypt certificates no longer valid for client authentication

Client authentication EKU removed from all certificates · Let's Encrypt announcement of 14 May 2025 · Let's Encrypt (ISRG)

MaritimeIndustryInfrastructure International Standard or protocol

Let's Encrypt removed the TLS client authentication extended key usage from its certificates: from an opt-in chain on 11 February 2026 and from every certificate on 13 May 2026. Systems that used a Let's Encrypt certificate to authenticate a client to a server (mutual TLS between sites, devices or services) need certificates from another source.

Let's Encrypt

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