SSL Troubleshooter

SSL Errors by Browser

Select your browser to find the relevant error solutions

ERR_CERT_COMMON_NAME_INVALID Error and Solution

The "NET::ERR_CERT_COMMON_NAME_INVALID" error in Chrome is caused by the SSL certificate not matching the domain name.

What Is ERR_CERT_COMMON_NAME_INVALID?

This error occurs in Google Chrome when the domain name in the website's SSL certificate (Common Name or SAN) does not match the URL being visited. The browser considers the connection unsafe and warns the user.

Causes of the Error

Certificate for the wrong domain: Certificate www.example.com was issued for, but example.com is accessed via.
Subdomain mismatch: Certificate example.com is valid for, but mail.example.com is accessed from a subdomain like this.
Wildcard certificate scope: *.example.com wildcard certificate, example.com (root domain) or alt.sub.example.com (second-level subdomain) is not valid.
Old or wrong certificate installed: A certificate belonging to a different domain may have been installed on the server.
Missing SAN (Subject Alternative Name): The relevant domain name is not listed in the certificate's SAN list.

Solution Steps

1. Check the Certificate Details

Click the lock icon in the browser's address bar to view the certificate details. Verify that the "Common Name" and "Subject Alternative Names" fields match your site's domain name.

2. www and non-www Redirection

If your certificate is only www.example.com valid for, example.com from the address www.example.com set up a 301 redirect to:

# Apache .htaccess
RewriteEngine On
RewriteCond %{HTTP_HOST} ^ornek\.com$ [NC]
RewriteRule ^(.*)$ https://www.ornek.com/$1 [R=301,L]

3. Buy the Right Certificate

If you use multiple domain names or subdomains:

Multi-Domain (SAN) SSL: Protect multiple different domain names with a single certificate
Wildcard SSL: All subdomains (*.example.com) protect

4. Regenerate the Certificate

Make sure you use the correct domain name when generating a CSR (Certificate Signing Request). You can use the DataSSL CSR Generator tool.

💡 Tip: All SSL certificates you purchase from DataSSL cover both www and non-www versions automatically.

Full Article Check SSL

ERR_CERT_DATE_INVALID Error and Solution

A browser error indicating that the SSL certificate has expired or is not yet valid.

ERR_CERT_AUTHORITY_INVALID Error and Solution

A browser error that occurs when the certificate authority is not recognized as trusted.

NET::ERR_CERT_REVOKED Error and Solution

An error indicating that the SSL certificate has been revoked by the certificate authority.

What Is the Browser SSL Trust Store?

What Is the Browser SSL Trust Store? error and solution guide.

End of TLS 1.0/1.1 Browser Support

End of TLS 1.0/1.1 Browser Support error and solution guide.

Opera SSL Certificate Errors

Opera SSL Certificate Errors error and solution guide.

Chrome ERR_BAD_SSL_CLIENT_AUTH_CERT

Chrome ERR_BAD_SSL_CLIENT_AUTH_CERT error and solution guide.

ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error and Solution

An error that occurs when no common SSL/TLS version or encryption algorithm can be found between the browser and the server.

iOS Safari SSL Errors

iOS Safari SSL Errors error and solution guide.

Safari SSL Certificate Trust Error

Safari SSL Certificate Trust Error error and solution guide.

Android Chrome SSL Errors

Android Chrome SSL Errors error and solution guide.

SSL Compatibility Issues in Old Browsers

SSL Compatibility Issues in Old Browsers error and solution guide.

Safari "This Connection Is Not Private" Error

Safari "This Connection Is Not Private" Error error and solution guide.

Incognito Window SSL Error Test

Incognito Window SSL Error Test error and solution guide.

Browser Developer Tools SSL Debug

Browser Developer Tools SSL Debug error and solution guide.

Clearing the Browser SSL Cache

Clearing the Browser SSL Cache error and solution guide.

ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN Error

An error caused by the certificate's public key not matching the previously pinned key.

ERR_SSL_PROTOCOL_ERROR Error and Solution

A generic error message indicating that a protocol-level error occurred while establishing an SSL connection in the Chrome browser.

Chrome ERR_SSL_UNRECOGNIZED_NAME_ALERT

Chrome ERR_SSL_UNRECOGNIZED_NAME_ALERT error and solution guide.

Brave Browser SSL Errors

Brave Browser SSL Errors error and solution guide.

Chrome ERR_CERT_NON_UNIQUE_NAME

Chrome ERR_CERT_NON_UNIQUE_NAME error and solution guide.

ERR_TOO_MANY_REDIRECTS and the SSL Loop

The infinite loop error caused by HTTP-HTTPS redirection, and its solution.

Chrome ERR_SSL_CLIENT_AUTH_CERT_NEEDED

Chrome ERR_SSL_CLIENT_AUTH_CERT_NEEDED error and solution guide.

ERR_CONNECTION_RESET and SSL Connection Drops

Connection reset error while establishing an SSL connection.

Chrome ERR_SSL_BAD_RECORD_MAC_ALERT

Chrome ERR_SSL_BAD_RECORD_MAC_ALERT error and solution guide.

Using Chrome Certificate Viewer

Using Chrome Certificate Viewer error and solution guide.

Chrome ERR_SSL_KEY_USAGE_INCOMPATIBLE

Chrome ERR_SSL_KEY_USAGE_INCOMPATIBLE error and solution guide.

ERR_CERTIFICATE_TRANSPARENCY_REQUIRED Error

An error caused by the SSL certificate not being recorded in Certificate Transparency logs.

Chrome NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM

Chrome NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM error and solution guide.

Edge NET::ERR_CERT_WEAK_KEY

Edge NET::ERR_CERT_WEAK_KEY error and solution guide.

Chrome ERR_SSL_SERVER_CERT_BAD_FORMAT

Chrome ERR_SSL_SERVER_CERT_BAD_FORMAT error and solution guide.

ERR_CERT_SYMANTEC_LEGACY Error

Chrome rejecting SSL certificates issued under the legacy Symantec infrastructure.

Chrome ERR_SSL_DECRYPT_ERROR_ALERT

Chrome ERR_SSL_DECRYPT_ERROR_ALERT error and solution guide.

SEC_ERROR_UNKNOWN_ISSUER (Firefox) Error

The error that occurs when Firefox does not recognize the authority that issued the SSL certificate.

SSL_ERROR_RX_RECORD_TOO_LONG Error

Error indicating that a data record received over the SSL connection is longer than expected.

SEC_ERROR_EXPIRED_CERTIFICATE (Firefox) Error

Error message in the Mozilla Firefox browser indicating that the SSL certificate has expired.

Firefox MOZILLA_PKIX_ERROR_MITM_DETECTED

Firefox MOZILLA_PKIX_ERROR_MITM_DETECTED error and solution guide.

Firefox SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE

Firefox SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE error and solution guide.

Firefox SSL_ERROR_HANDSHAKE_FAILURE_ALERT

Firefox SSL_ERROR_HANDSHAKE_FAILURE_ALERT error and solution guide.

Firefox MOZILLA_PKIX_ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED

Firefox MOZILLA_PKIX_ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED error and solution guide.

Firefox SSL_ERROR_NO_CYPHER_OVERLAP

Firefox SSL_ERROR_NO_CYPHER_OVERLAP error and solution guide.

Firefox SEC_ERROR_OCSP_INVALID_SIGNING_CERT

Firefox SEC_ERROR_OCSP_INVALID_SIGNING_CERT error and solution guide.

Firefox SEC_ERROR_OCSP_FUTURE_RESPONSE

Firefox SEC_ERROR_OCSP_FUTURE_RESPONSE error and solution guide.

Firefox SEC_ERROR_REUSED_ISSUER_AND_SERIAL

Firefox SEC_ERROR_REUSED_ISSUER_AND_SERIAL error and solution guide.

Firefox SEC_ERROR_OCSP_OLD_RESPONSE

Firefox SEC_ERROR_OCSP_OLD_RESPONSE error and solution guide.

Edge DLG_FLAGS_INVALID_CA

Edge DLG_FLAGS_INVALID_CA error and solution guide.

Edge DLG_FLAGS_SEC_CERT_CN_INVALID

Edge DLG_FLAGS_SEC_CERT_CN_INVALID error and solution guide.

DLG_FLAGS_SEC_CERT_DATE_INVALID (Edge/IE) Error

Certificate date mismatch error in Microsoft Edge and Internet Explorer browsers.

Edge INET_E_SECURITY_PROBLEM

Edge INET_E_SECURITY_PROBLEM error and solution guide.

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SSL Errors by Browser

ERR_CERT_COMMON_NAME_INVALID Error and Solution

What Is ERR_CERT_COMMON_NAME_INVALID?

Causes of the Error

Solution Steps

1. Check the Certificate Details

2. www and non-www Redirection

3. Buy the Right Certificate

4. Regenerate the Certificate

ERR_CERT_DATE_INVALID Error and Solution

What Is ERR_CERT_DATE_INVALID?

Causes of the Error

Solution Steps

1. Check the Certificate Dates

2. Update Your Computer Clock

3. Renew the SSL Certificate

4. Update the Certificate Chain

ERR_CERT_AUTHORITY_INVALID Error and Solution

What Is ERR_CERT_AUTHORITY_INVALID?

Causes of the Error

Solution Steps

1. Get a Certificate from a Trusted CA

2. Install the Intermediate Certificate Chain

3. Check with the SSL Checker

NET::ERR_CERT_REVOKED Error and Solution

What Is NET::ERR_CERT_REVOKED?

Why Is a Certificate Revoked?

Solution Steps

What Is the Browser SSL Trust Store?

Causes of the Error

Solution Steps

Tests

💡 Tips

End of TLS 1.0/1.1 Browser Support

Causes of the Error

Solution Steps

Tests

💡 Tips

Opera SSL Certificate Errors

Causes of the Error

Solution Steps

Tests

💡 Tips

Chrome ERR_BAD_SSL_CLIENT_AUTH_CERT

Causes of the Error

Solution Steps

Tests

💡 Tips

ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error and Solution

What Is ERR_SSL_VERSION_OR_CIPHER_MISMATCH?

Causes of the Error

Solution Steps

1. Enable TLS 1.2 and 1.3

2. Use Strong Cipher Suites

3. Check the Certificate Type

iOS Safari SSL Errors

Causes of the Error

Solution Steps

Tests

💡 Tips

Safari SSL Certificate Trust Error

Causes of the Error

Solution Steps

Tests

💡 Tips

Android Chrome SSL Errors

Causes of the Error

Solution Steps

Tests

💡 Tips

SSL Compatibility Issues in Old Browsers

Causes of the Error

Solution Steps

Tests

💡 Tips

Safari "This Connection Is Not Private" Error

Causes of the Error

Solution Steps