GCP Internal Server Error HTTPS With WordPress – Rocon

Got a GCP Internal Server Error HTTPS with WordPress? You’re not alone. This is a real pain and can bring your site to a standstill, leaving visitors locked out and your business offline. Whether you have a high traffic blog or an eCommerce site on Google Cloud Platform (GCP), this error means a server, HTTPS or WordPress config issue.

The good news is it’s fixable. In this post we’ll walk you through the exact steps to troubleshoot and fix the GCP Internal Server Error HTTPS with WordPress, even if you’re not a server expert. Stay with us—we’ll break it down step by step from server logs to SSL setups so you can get your site back up and running quickly and avoid this in the future.

Google Cloud Platform (GCP) is a great way to host WordPress because it has a lot of capability. But it does have certain problems, notably when it comes to 500 Internal Server Errors over HTTPS.

These issues can be hard to understand and keep people from getting to your site, which hurts both SEO and the user experience. This guide’s goal is to explain the reasons behind the problems and give step-by-step fixes that work for WordPress sites hosted on GCP.

A 500 Internal Server Error is a general HTTP status code that means something is wrong with the server, but it can’t say what the problem is. When it comes to WordPress and HTTPS, this problem usually comes from:

• Files that are set up wrong (.htaccess, wp-config)
• Limits on PHP memory or timeouts for scripts
• Conflicts between plugins or themes
• Problems with SSL or HTTPS redirection
• Wrong permissions

Server is set up wrong

Compute Engine, Cloud Load Balancing, SSL certificates, Apache/Nginx, and WordPress all work together on GCP. Mistakes happen a lot because of:

• Rules for the GCP Load Balancer that are not set up correctly
• SSL certificates that have expired or don’t match
• Wrong way to redirect from HTTP to HTTPS
• Service resumes incorrectly after an update
• Problems with plugins and themes that cause HTTPS to act strangely

Here are a few times when HTTPS gives you the 500 error:

• You enabled HTTPS not too long ago, but you didn’t update all of the internal URLs.
• The SSL certificate from Let’s Encrypt didn’t renew.
• Using .htaccess, HTTP traffic is being forced to go to HTTPS, although SSL isn’t available.
• The GCP Load Balancer isn’t sending SSL headers correctly.
• You changed the name of your site or domain but didn’t update the URLs.

Step 1: Confirm It’s a 500 Error

Before diving in:

1. Open your site in Incognito.
2. Press F12 to open Developer Tools and go to the “Network” tab.
3. Refresh the page and check the response code. A 500 error will be clearly visible.

You can also use curl from your terminal:

bash

curl -I https://yourdomain.com

Step 2: Check HTTPS and SSL Certificate Setup

Use the following tools:

• SSL Checker (e.g., https://www.sslshopper.com)
• GCP Certificate Manager for certificate status
• Verify if the domain points to the correct IP

Check if the SSL is valid and matches your domain:

bash

openssl s_client -connect yourdomain.com:443

Make sure HTTPS is enabled in GCP:

• Go to GCP Console > Load Balancing > Frontend Configuration
• Ensure HTTPS (port 443) is set up with the correct certificate

Step 3: Review WordPress Configuration

Make sure the WordPress site URLs are set correctly in the database or wp-config.php:

php

define(‘WP_HOME’,’https://yourdomain.com’);

define(‘WP_SITEURL’,’https://yourdomain.com’);

Avoid conflicts with database-stored URLs.

Step 4: Inspect Error Logs

Check both Apache/Nginx logs and PHP logs. On GCP (especially with Bitnami stacks), logs are usually found at:

bash

/opt/bitnami/apache2/logs/error_log

/opt/bitnami/php/var/log/php-fpm.log

Use:

Bash
tail -n 50 error_log

Look for fatal errors, permission denials, or memory limit issues.

Step 5: Check .htaccess File

A corrupted .htaccess can easily trigger 500 errors during redirection.

To regenerate:

bash

mv .htaccess .htaccess.bak

Then log into the WordPress dashboard (if accessible) and go to:

Settings > Permalinks > Save

This will auto-generate a clean .htaccess.

Step 6: Increase PHP Memory Limit

Low memory can crash your WordPress site.

Edit wp-config.php:

php

define(‘WP_MEMORY_LIMIT’, ‘256M’);

Also update php.ini or .user.ini:

ini

memory_limit = 256M

Restart services:

bash

sudo /opt/bitnami/ctlscript.sh restart

Step 7: Disable Plugins Temporarily

Some plugins (especially for SSL/HTTPS redirection) may cause conflicts.

1. Access your server via SSH or SFTP.
2. Rename the plugins folder:

bash

mv wp-content/plugins wp-content/plugins-old

Check your site again. If it works, rename individual plugin folders to find the culprit.

Step 8: Switch to a Default Theme

A poorly coded theme can also throw a 500 error.

1. Go to the WordPress database via phpMyAdmin or SSH.
2. In the wp_options table, change:

cpp

template → twentytwentyfour  

stylesheet → twentytwentyfour

Step 9: Permissions and Ownership Issues

File permissions on WordPress should be:

bash

find . -type d -exec chmod 755 {} \;

find . -type f -exec chmod 644 {} \;

And ownership (for Bitnami):

bash

sudo chown -R bitnami:daemon /opt/bitnami/wordpress

Step 10: Check PHP Version and Compatibility

Incompatible plugins or themes with the current PHP version can crash WordPress.

Check current PHP version:

bash

php -v

To change PHP version in GCP, you may need to modify your instance image or use Google App Engine flexible environment.

Step 11: Clear Cache and Restart Services

Caching issues from plugins or server can cause errors.

Clear all caches:

• WordPress cache plugin (if available)
• Cloudflare (if in use)
• Server cache

Restart Apache and PHP:

bash

sudo /opt/bitnami/ctlscript.sh restart apache

Step 12: Use GCP Load Balancer Correctly

If you’re using GCP’s HTTPS Load Balancer:

• Ensure that backend services are healthy.
• Set the correct HTTP to HTTPS redirect (don’t double-redirect).
• Headers like X-Forwarded-Proto must be passed.

In wp-config.php, force HTTPS:

php

if ($_SERVER[‘HTTP_X_FORWARDED_PROTO’] == ‘https’)

    $_SERVER[‘HTTPS’]=’on’;

Step 13: Fixing Rewrite Rules and Mixed Content

HTTPS errors may sometimes stem from HTTP content being loaded, especially with plugins forcing redirects.

Use:

bash

grep -Ri “http://” wp-content/

Replace all HTTP references with HTTPS.

• Use uptime monitoring tools
• Automate backups
• Monitor GCP’s SSL cert expiry (using Certbot or Cloud Monitoring)
• Apply updates on staging before production

• Use a containerized setup (e.g., with Docker + Kubernetes) if scaling.
• Use Cloud CDN with HTTPS edge termination for performance.
• Keep plugins and themes minimal and well-maintained.
• Prefer App Engine or Cloud Run for managed hosting.

The WordPress Command Line Interface (WP-CLI) is a powerful tool for diagnosing internal server errors. If your site is inaccessible via browser, WP-CLI still lets you run checks, disable plugins, or update configurations directly from the terminal. For example:

bash

wp plugin deactivate –all

wp core check-update

You can also check if the database is accessible and fetch configuration variables:

bash

wp config get WP_HOME

wp config get WP_SITEURL

This helps you narrow down the source of the 500 error even without a GUI.

Bitnami WordPress stacks are common on GCP and come with a bundled stack of Apache, MySQL, and PHP. When troubleshooting, restarting all services ensures any temporary misconfigurations are cleared:

bash

sudo /opt/bitnami/ctlscript.sh restart

Use the status command to confirm all services are running:

bash

sudo /opt/bitnami/ctlscript.sh status

This is particularly helpful after making changes to configuration files or PHP settings.

Incorrect firewall or port settings can lead to connection errors masquerading as 500 Internal Server Errors. Verify that HTTPS (port 443) is open in the GCP Console:

1. Go to VPC Network > Firewall Rules.
2. Ensure a rule allows ingress on TCP:443 to the VM.
3. Verify Load Balancer forwarding rules are correctly pointing to backend services.

Sometimes GCP firewall rules might be too restrictive after deploying new services. Always double-check them.

Redirection loops often occur when HTTPS is enforced at multiple levels: GCP Load Balancer, .htaccess, and WordPress configuration. This can cause 500 errors or infinite redirects. To prevent this:

• Remove force HTTPS rules in .htaccess if GCP Load Balancer already handles it.
• Use only one redirection method.
• Set the correct headers like X-Forwarded-Proto and add in wp-config.php:

php

if (isset($_SERVER[‘HTTP_X_FORWARDED_PROTO’]) && $_SERVER[‘HTTP_X_FORWARDED_PROTO’] == ‘https’) {

    $_SERVER[‘HTTPS’] = ‘on’;

}

When all else fails, don’t hesitate to seek help from official support channels. GCP support can assist with infrastructure issues such as load balancers, firewall, and SSL provisioning. For WordPress-specific issues:

• Contact plugin developers (especially caching, security, and redirect plugins).
• Post on WordPress.org forums with error logs.
• Use Stack Overflow or GCP support tickets for urgent help.

Timely support can help prevent hours of debugging and quickly identify overlooked misconfigurations.

GCP Internal Server Error HTTPS with WordPress can be scary but with the right steps it’s manageable. From checking your server logs and SSL certificates to fixing .htaccess files or plugin conflicts each step gets you closer to a working site. Google Cloud Platform is powerful—but that means small mistakes can cause big problems. Just stay calm and follow a process. If you followed above your site should be up and running over HTTPS.

Still stuck? Don’t worry—there’s always deeper server level checks or support forums to help. Bookmark this article so you can come back to it whenever an error pops up and keep your GCP and WordPress setup optimised for performance and reliability.

A 500 Internal Server Error over HTTPS in GCP can be frustrating, especially with WordPress. The key is methodically checking configurations—SSL, plugins, memory limits, file permissions, and server logs. With GCP’s powerful infrastructure and WordPress’s flexibility, these errors are resolvable with the right approach.