Magento 2 products in cart from other session

Question

Strange behavior in Magento 2.2.8! When I leave the page for a few minutes and then do a refresh, products from other user sessions are in my cart! 20 minutes refreshing and there are 17 products in my cart and I didn't do anything. I do not use SID in the URL.

Update: Disabling full page cache didn't work, added my env.php. The problem occurs on 2 sites, one in magento 2.2.8 and one in 2.3.1. Configuration is Nginx - Apache - Redis - php 7.1

Also, it didn't matter what kind of session caching I use (database, files or Redis)

'resource' => [
    'default_setup' => [
        'connection' => 'default'
    ]
],
'x-frame-options' => 'SAMEORIGIN',
'MAGE_MODE' => 'production',
'session' => [
    'save' => 'redis',
    'redis' => [
        'host' => '127.0.0.1',
        'port' => '6379',
        'password' => '',
        'timeout' => '2.5',
        'persistent_identifier' => '',
        'database' => '2',
        'compression_threshold' => '2048',
        'compression_library' => 'gzip',
        'log_level' => '3',
        'max_concurrency' => '6',
        'break_after_frontend' => '5',
        'break_after_adminhtml' => '30',
        'first_lifetime' => '600',
        'bot_first_lifetime' => '60',
        'bot_lifetime' => '7200',
        'disable_locking' => '0',
        'min_lifetime' => '60',
        'max_lifetime' => '2592000'
    ]
],
'cache_types' => [
    'config' => 1,
    'layout' => 1,
    'block_html' => 1,
    'collections' => 1,
    'reflection' => 1,
    'db_ddl' => 1,
    'eav' => 1,
    'customer_notification' => 1,
    'config_integration' => 1,
    'config_integration_api' => 1,
    'full_page' => 0,
    'translate' => 1,
    'config_webservice' => 1,
    'compiled_config' => 1,
    'vertex' => 1
],
'install' => [
    'date' => 'Thu, 17 May 2018 11:30:44 +0000'
],
'cache' => [
    'frontend' => [
        'default' => [
            'backend' => 'Cm_Cache_Backend_Redis',
            'backend_options' => [
                'server' => '127.0.0.1',
                'database' => '0',
                'port' => '6379'
            ]
        ],
        'page_cache' => [
            'backend' => 'Cm_Cache_Backend_Redis',
            'backend_options' => [
                'server' => '127.0.0.1',
                'port' => '6379',
                'database' => '1',
                'compress_data' => '0'
            ]
        ]
    ]
]
];

Answer 1

If you are having this problem across multiple different installations using different versions of Magento, then I suggest it is an issue with caching on your local machine.

Please clear your browser cache directly from the browser settings and then close the browser. Empty temp directories. If CCleaner is installed, tick all of the cache/session options for your web browser and run CCleaner to clear up any files you might have missed.

Open your browser again and test the website.

If the problem persists, try again on a different browser with an empty cache after rebooting your machine. I've noticed that, with Firefox at least, some things are persistent which should not be persistent.

If you still get this problem, then disable all unnecessary modules, run cache:flush, setup:upgrade, setup:di:compile and setup:static-content:deploy -f.

Can you please provide an explanation of the process you use when you make a fresh installation?

EDIT:

Please could you try removing the redis settings from your env.php for only the session cache, but continue using redis for default and full page cache.

Although it is not exactly a solution, it should allow your site to load quickly without interfering with orders.

I would suggest that you raise this issue on the Magento 2 github page.

If you are following the standard server setup instructions and using a vanilla install of magento then it sounds more like a bug than a mistake you've made.

Answer 2

It was a long search,but it was a problem with microcaching in engintron Nginx.

Ad this to your custom rules and the problem is gone

if ($SITE_URI ~* "yoursite.nl") {
   set $CACHE_BYPASS_FOR_DYNAMIC 1; # Disables micro-caching
   set $CACHE_BYPASS_FOR_STATIC 1; # Disables static file caching
}