ERR_SSL_UNRECOGNIZED_NAME_ALERT

Enterno.io Editorial Team

By Anatoly Oshmanovsky · Updated Apr 18, 2026

Key idea:

ERR_SSL_UNRECOGNIZED_NAME_ALERT — TLS alert 112: server has no cert for the requested SNI hostname. Causes: misconfigured nginx (missing server_name), Cloudflare Workers without a custom cert, legacy server with a single cert for all virtual hosts. Fix: add server block for requested hostname + valid cert.

Below: causes, fixes, FAQ.

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Common Causes

nginx server_name mismatch — cert issued for a different domain
Cloudflare — domain not in account's zones
AWS ALB target group without HTTPS listener for this hostname
Shared hosting (DirectAdmin, cPanel) — wrong vhost routing
Load balancer SNI-based routing broken

Step-by-Step Fix

nginx: verify server_name matches requested hostname exactly
Cloudflare: add DNS record + enable proxy
ALB: ensure HTTPS listener has cert bound to hostname
Test SNI: openssl s_client -connect ip:443 -servername hostname
Enterno SSL for external verify

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Related SSL Errors

CertificateExpiry, issuer, domains (SAN)

ChainIntermediate and root CA validation

TLS ProtocolTLS version and cipher suite

VulnerabilitiesHeartbleed, POODLE, weak ciphers

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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.

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

DV vs OV vs EV Certificates

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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.

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Errors

Frequently Asked Questions

Is SNI mandatory in 2026?

Yes. All modern browsers send SNI. Server without SNI support = legacy, fails with multiple HTTPS vhosts.

Default vhost fallback?

nginx: <code>server_name _;</code> matches undefined hosts. But cert must still match SNI (otherwise UNRECOGNIZED_NAME).

Encrypted SNI (ECH)?

ECH (RFC 9460) encrypts SNI in TLS 1.3. Cloudflare supports 2023+, Chrome partial. Does not cause this error — server-side config is target.

Monitor cert match?

<a href="/en/ssl">Enterno SSL checker</a> validates cert-vs-hostname. <a href="/en/monitors">Scheduled monitors</a> alert on mismatch.