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Cloudflare Docs

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Certification Authority Authorization (CAA) FAQ
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Reference
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Troubleshooting
ERR_SSL_VERSION_OR_CIPHER_MISMATCH
ERR_TOO_MANY_REDIRECTS

TLS protocols

Cloudflare supports the following TLS protocols:

TLS 1.0
TLS 1.1
TLS 1.2
TLS 1.3 ( recommended)