[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Security](./puppeteer.protocol.security.md) > [CertificateSecurityState](./puppeteer.protocol.security.certificatesecuritystate.md) > [certificateNetworkError](./puppeteer.protocol.security.certificatesecuritystate.certificatenetworkerror.md) ## Protocol.Security.CertificateSecurityState.certificateNetworkError property The highest priority network error code, if the certificate has an error. Signature: ```typescript certificateNetworkError?: string; ```