A Redis object cache redirect-login-loop could be caused by several factors, such as misconfiguration, plugin conflicts, or incorrect cache settings. Here are some possible reasons for the issue and potential solutions:
Misconfiguration: Ensure that the Redis configuration in your wp-config.php file is correct. Double-check your Redis host, port, and password settings to ensure they match your Redis server.
Plugin conflicts: There may be a conflict with another plugin or your theme that is causing the redirect loop. To identify the conflicting plugin, disable all other plugins except the Redis Object Cache plugin, then enable the plugins one by one to see if the issue reoccurs. If the problem persists after disabling all plugins, try switching to a default WordPress theme like Twenty Twenty-One to check if the theme is causing the issue.
Incorrect cache settings: Certain cache settings or cache keys might be causing the redirect loop. For instance, user session data, authentication cookies, or nonce values should not be cached, as they are unique for each user. Make sure your Redis Object Cache plugin is configured correctly to exclude these values from being cached.
PHP session handling: If your site relies on PHP sessions, ensure that the session handling is configured properly. Some hosting providers may store PHP session data in Redis, which could cause conflicts with the Redis Object Cache plugin.
Server-side caching: If your hosting environment uses server-side caching, like Varnish or NGINX FastCGI cache, there might be a conflict with the Redis Object Cache. Verify that your server-side caching is configured to work seamlessly with Redis and WordPress.
If you’re still experiencing the issue after trying the above solutions, consider reaching out to the plugin developer for support or consulting with a web development professional familiar with Redis and WordPress to help you diagnose and resolve the issue.
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