Fixing OpenCart Internal Server Error

July 4, 2017

Error 500 Internal Server Error after transferring web host

Check Apache error logs (usually $HOME/logs/error_log)

1. Option FollowSymlinks not allowed here

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Option FollowSymlinks not allowed here

Chances are you're on Virtualmin.

Any Virtualmin site that uses FollowSymLinks can be exploited to allow that user to read all files in /home. That was creating a nightmare

Virtualmin adds some Options as part of a security fix that could otherwise cause all your websites to be compromised if one of them gets hacked. FollowSymlinks gets replaced with SymLinksifOwnerMatch

You'll need to edit the .htaccess file for your opencart store and replace

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Options +FollowSymlinks

with

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Options +SymLinksifOwnerMatch

You can update all .htaccess files for your sites with

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find /home -name ".htaccess" -type f -exec sed -i 's/FollowSymLinks/SymLinksIfOwnerMatch/g' {} ";"

2. Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration

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Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration

chances are that rewrite module for Apache is disabled. You can enable it with the following command

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sudo a2enmod rewrite
sudo service apache2 restart

3. PHP Fatal error: Uncaught Error: Call to undefined function mysql_connect()

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 PHP Fatal error:  Uncaught Error: Call to undefined function mysql_connect() in /home/blah/public_html/system/database/mysql.php:6

mysql_connect() is deprecated now. Older versions of OpenCart used it (1.5.6), but it was updated later on. mysqli_connect() is the replacement. You need to use a driver other than MySQL driver (PDO, MySQLi) to get rid of the error

Update BOTH config.php (config.php and admin/config.php) files line to:

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define('DB_DRIVER', 'mysqli');

link

4. PHP Fatal error: Uncaught Error: Call to undefined method mysqli::escape()

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PHP Fatal error:  Uncaught Error: Call to undefined method mysqli::escape()

make sure the MySQLi extension for PHP is installed and enabled link

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# sudo apt-get install php5-mysql # for PHP5, deprecated
sudo apt-get install php-mysql

By Default MySQLi extension is disable in PHP 7. To enable, edit php.ini (Apache2, PHP 7, Ubuntu environment)

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nano /etc/php/7.0/apache2/php.ini

and add this line

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extension=php_mysqli.so

5. mod_fcgid: stderr: PHP Parse error: syntax error, unexpected 'else' (T_ELSE), expecting function (T_FUNCTION)

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mod_fcgid: stderr: PHP Parse error:  syntax error, unexpected 'else' (T_ELSE), expecting function (T_FUNCTION) in /home/blah/public_html/system/database/mysqli.php on line 54

then this means you're probably using OC 1.5.6x? The developer made some changes that broke mysqli. You can get newer versions (get the next closest version from your current install) of system/database/mysqli.php & system/library/db.php (get both, one depends on the other) and replace the old ones link

Check your opencart version by viewing the index.php file, you'll get something like

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define('VERSION', '1.5.6');

Now download the files for the next release of OpenCart from the official site's downloads section (in this case got 1.5.6.1)

6. PHP Fatal error: Uncaught Error: Call to undefined function mcrypt_create_iv()

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PHP Fatal error:  Uncaught Error: Call to undefined function mcrypt_create_iv()

Make sure mcrypt module is installed

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sudo apt-get install mcrypt php7.0-mcrypt

Restart Apache afterwards

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sudo service apache2 restart

7. PHP Fatal error: require_once(): Failed opening required

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PHP Fatal error:  require_once(): Failed opening required '/system/startup.php' (include_path='.:/usr/share/php:/usr/share/pear') in index.php on line 23

Check your server paths in config.php and admin/config.php.

This error can happen after you have transferred your opencart site and the paths may have changed (for example, when moving from cpanel /home/user/site to barebones/webmin based server /var/www/site)

8. fopen(), fwrite() and fclose() warning

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PHP Warning:  fopen(system/logs/error.txt): failed to open stream: Permission denied in system/library/log.php on line 12

PHP Warning:  fwrite() expects parameter 1 to be resource, boolean given in system/library/log.php on line 14

PHP Warning:  fclose() expects parameter 1 to be resource, boolean given in system/library/log.php on line 16

Your log and cache folders are not writable anymore. source Double check your permissions

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# chown -R www-data:www-data /var/www
chmod 777 system/logs/ -R
chmod 777 system/cache/ -R

Different opencart versions have different opencart folder structure

Clean vqcache

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rm -rf /home/MYSITE/public_html/vqmod/vqcache/*

Links

.htaccess: Option FollowSymLinks not allowed here