How to Fix cPanel SSL/TLS Certificate Errors — HTTPS Issues

In this tutorial, you'll learn about How to Fix cPanel SSL/TLS Certificate Errors. We cover key concepts, practical examples, and best practices.

The Problem

Your site shows SSL errors:

NET::ERR_CERT_AUTHORITY_INVALID

or:

AutoSSL failed to install a certificate.

Quick Fix

Step 1: Run AutoSSL

cPanel > SSL/TLS > Manage AutoSSL

Click "Run AutoSSL" for your domain.

Step 2: Check AutoSSL logs

cat /usr/local/cpanel/logs/autossl.log | grep "example.com"

Common errors:

• "DCV failed" — Domain Control Validation failed. Check DNS.
• "Rate limited" — Too many attempts. Wait 24 hours.

Step 3: Fix Domain Control Validation (DCV)

Ensure these DNS records exist:

# Check TXT records for DCV:
dig TXT _acme-challenge.example.com

Also verify that the domain resolves to the server IP.

Step 4: Install a manual certificate

cPanel > SSL/TLS > Install and Manage SSL for your site (HTTPS)

Paste:

• Certificate (CRT)
• Private Key
• Certificate Authority Bundle (CABundle)

Step 5: Redirect HTTP to HTTPS

# In .htaccess:
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]

Step 6: Fix mixed content warnings

Search for hardcoded http:// URLs in your site and replace with https:// or protocol-relative URLs (//).

Prevention

• Keep AutoSSL enabled for automatic certificate renewal.
• Ensure DNS resolves before running AutoSSL.
• Use relative URLs for internal resources.

Common Mistakes with ssl tls

1. Non-exhaustive pattern matches that compile with warnings then crash at runtime
2. Misunderstanding that String is [Char] with poor performance for large text operations
3. Using foldl instead of foldl' causing stack overflow on large lists

These mistakes appear frequently in real-world CPANEL code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

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