NET::ERR_CERT_INVALID — Generic Chrome

Enterno.io Editorial Team

NET::ERR_CERT_INVALID: Details

By Anatoly Oshmanovsky · Updated Apr 18, 2026

Key idea:

NET::ERR_CERT_INVALID — Chrome's generic category for any cert validation failure (more specific: AUTHORITY_INVALID, DATE_INVALID, COMMON_NAME_INVALID). If you only see generic — Chrome could not narrow category. Fix: nslookup + openssl s_client for detailed analysis.

Below: causes, fixes, FAQ.

Try it now — free →

Common Causes

Cert completely malformed (non-DER/PEM)
Cert issued for wrong key type
Chain cycle (A signs B, B signs A)
Legacy cert SHA-1 signature (deprecated)
Multiple concurrent issues

Step-by-Step Fix

openssl x509 -in cert.pem -text -noout — parse cert
openssl s_client -connect host:443 -servername host — live handshake
Enterno SSL Checker — automatic analysis
chrome://net-export/ — save network log for analysis
Reissue via Let's Encrypt — fresh start

Check SSL Certificate →

Related SSL Errors

CertificateExpiry, issuer, domains (SAN)

ChainIntermediate and root CA validation

TLS ProtocolTLS version and cipher suite

VulnerabilitiesHeartbleed, POODLE, weak ciphers

Why teams trust us

TLS 1.3

supported

Full

CA chain check

<2s

result

30/14/7

days-to-expiry alerts

How it works

Enter domain

TLS chain verified

Expiry date & vulnerabilities

What Does the SSL Check Cover?

SSL/TLS is the encryption protocol that protects data between the browser and server. Our tool analyzes the certificate, chain of trust, TLS version, and knownvulnerabilities.

Certificate Details

Issuer, validity period, signature algorithm, covered domains (SAN), and validation type (DV/OV/EV).

Chain of Trust

Full chain verification: from leaf certificate through intermediates to root CA.

TLS Analysis

Protocol version (TLS 1.2/1.3), cipher suites, Perfect Forward Secrecy (PFS) support.

Expiry Alerts

Set up a monitor — get Telegram and email alerts 30/14/7 days before expiration.

DV vs OV vs EV Certificates

DV (Domain Validation)

Confirms domain ownership only
Issued in minutes automatically
Free via Let's Encrypt
Suitable for most websites
Most common certificate type

OV / EV

Organization (OV) or Extended Validation (EV)
Issued in 1-5 business days
Costs $50 to $500/year
For finance, e-commerce, government sites
Increases user trust

Who uses this

DevOps

SSL certificate monitoring

Security

TLS config audit

SEO

HTTPS as ranking factor

E-commerce

customer trust

Common Mistakes

❌

Expired certificateBrowsers block sites with expired SSL. Set up auto-renewal or monitoring.

❌

Incomplete certificate chainWithout intermediate CA, some browsers and bots cannot verify the certificate.

❌

Mixed content on HTTPS siteHTTP resources on an HTTPS page — the browser lock icon disappears, reducing trust.

❌

Using TLS 1.0/1.1Legacy TLS versions have known vulnerabilities. Use TLS 1.2+ or 1.3.

❌

Domain mismatch in certificateThe certificate must cover all site domains, including www and subdomains.

Best Practices

✓

Set up auto-renewalLet's Encrypt + certbot with cron — certificate renews automatically every 60-90 days.

✓

Enable HSTSStrict-Transport-Security header forces browsers to always use HTTPS.

✓

Use TLS 1.3TLS 1.3 is faster (1-RTT handshake) and safer — legacy ciphers removed.

✓

Monitor expiration datesCreate a monitor on Enterno.io — get notified well before expiration.

✓

Verify chain after renewalAfter certificate renewal, confirm that intermediate certificates are installed.

Get more with a free account

SSL certificate monitoring, check history and alerts 30 days before expiry.

Learn more

Research

TLS 1.3 Adoption 2026: Growth Pace

Errors

Frequently Asked Questions

Why generic?

Chrome cannot always narrowly classify. If cert has several issues simultaneously — generic.

Log for analysis?

chrome://net-export/ → Capture → Export JSON. Opaque for non-experts but reports the issue precisely.

Quick diagnosis?

SSLLabs or Enterno SSL Checker. Give specific reason + suggest fix.

Self-signed = ERR_CERT_INVALID?

Usually ERR_CERT_AUTHORITY_INVALID. Generic _INVALID is rarer.