Troubleshooting Error 500 When Migrating a PrestaShop 1.7 Site to Localhost

Migrating PrestaShop to Localhost: A Deep Dive into Resolving Error 500

This insight summarizes a PrestaShop forum thread where a user, FS47, encountered an Error 500 while attempting to migrate a live PrestaShop 1.7.8.11 site to a local development environment using Laragon. The thread provides valuable troubleshooting steps for anyone facing similar issues.

Initial Problem:

FS47 successfully installed Laragon, created a database (named identically to the live database), imported the SQL dump, and copied the 'public_html' files to Laragon's WWW directory. However, after updating the _short_url table and attempting to edit the database credentials (which were missing from the expected settings.inc.php), the site returned an Error 500.

Key Discussion Points and Solutions:

• Configuration File Location: Eolia pointed out that in PrestaShop 1.7, the database credentials are located in /app/config/parameters.php, not settings.inc.php.
• Domain Redirection: After updating the database credentials, the site redirected to the live domain. The user had to ensure the _short_url table was correctly updated to 127.0.0.1.
• SSL Certificate Issues: The error shifted to an SSL-related issue, as the local environment lacked a valid SSL certificate. Eolia suggested disabling SSL verification in the PrestaShop back office (BO), which was inaccessible to the user at that point.
• Cache Clearing: Clearing the cache was recommended. The cache directory location was identified as /var/cache. The user was advised to delete the contents of cache and cache- directories.
• .htaccess Configuration: 4presta suggested modifying SEO & URLs settings in the back office to regenerate the .htaccess file after URL rewriting is disabled and re-enabled. The user initially deleted the .htaccess file, which was not the correct approach.
• Debugging Mode: ComGrafPL recommended enabling debug mode to identify the root cause of the error. This was achieved by modifying config/defines.inc.php:

define('_PS_MODE_DEV_', false);

was changed to:

define('_PS_MODE_DEV_', true);

• Database Credentials (XAMPP): The user later switched to XAMPP and inquired about default database credentials. Eolia advised against using the root user and recommended creating a dedicated PrestaShop user with appropriate privileges.
• Missing Constants: Enabling debug mode revealed issues with missing constants, potentially indicating incomplete or corrupted configuration files.

Outcome:

While the thread didn't reach a definitive resolution, it provided numerous troubleshooting steps and insights into common pitfalls when migrating a PrestaShop 1.7 site to a local environment. The suggestions covered database configuration, cache management, .htaccess settings, and debugging techniques.

Mediacom87 chimed in with a contrarian view, suggesting that developing directly on a live (or staging) server avoids the complexities of local development.

coeos.pro mentioned that _PS_THEME_MOBILE_DIR_ has been removed from PrestaShop for a while, though its relevance to the main issue is unclear.