---
title: tls.client.certificate.is_cert_missing
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/tls-client-certificate-is-cert-missing
---

**Type:** BOOL  
**Access:** read-only

**Available in:** recv, hash, deliver, log

True if this connection is set to mutual TLS optional mode and the client does not provide a certificate during the handshake.