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Error code

Cloudflare 526 —STST SSL-1999

Cloudflare considers the certificate of the server of which is invalid in strict mode.

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Cloudflare 526. —STST SSL-1999.

Domain : Web. & TLSPriority: High

What does this error mean?

Cloudflare considers the certificate of the server of which is invalid in strict mode.

Probable causes

  • certificate expired
  • name of absent host.
  • incomplete chain.

Verification and resolution

  1. Check SAN.
  2. Control complete chain.
  3. Test date and authority.
Precaution: Correct the certificate of origin rather than reduce validation.

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Quick diagnostic.

To diagnose Cloudflare code 526 in the Web domain. & TLS, start with the following check: Check SAN. Then compare the result to this probable cause: certificate expired. Save the context and time of appearance to compare the behavior before and after correction. Priority level indicated: High.

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