Title: Nginx Cron Directive causing Loopback Error Last modified: September 10, 2023 --- # Nginx Cron Directive causing Loopback Error * [wykananda](https://wordpress.org/support/users/wykananda/) * (@wykananda) * [3 years, 1 month ago](https://wordpress.org/support/topic/nginx-cron-directive-causing-loopback-error/) * We’re using Plesk Obsidian with Nginx with WordPress 6.2. We’re getting a 405 loopback error in the WordPress “Site Health” check-up when this line is enabled in the “Addition Nginx directives” box of the “Apache & Nginx Settings” (please see the attached image below): * `location /wp-cron.php { add_header Cache-Control "no-cache, no-store, must-revalidate, max-age=0"; expires -1; }` * When the line is (#) commented out, no loopback error is reported. * Please advise. * ![](https://drive.google.com/file/d/13dC0cey8kLScwv5Re7h064Z-9EaV8nNw/view?usp =share_link) * [https://drive.google.com/file/d/13dC0cey8kLScwv5Re7h064Z-9EaV8nNw/view?usp=share_link](https://drive.google.com/file/d/13dC0cey8kLScwv5Re7h064Z-9EaV8nNw/view?usp=share_link) - This topic was modified 3 years, 1 month ago by [wykananda](https://wordpress.org/support/users/wykananda/). - This topic was modified 3 years, 1 month ago by [wykananda](https://wordpress.org/support/users/wykananda/). - This topic was modified 3 years, 1 month ago by [wykananda](https://wordpress.org/support/users/wykananda/). Viewing 4 replies - 1 through 4 (of 4 total) * Thread Starter [wykananda](https://wordpress.org/support/users/wykananda/) * (@wykananda) * [3 years, 1 month ago](https://wordpress.org/support/topic/nginx-cron-directive-causing-loopback-error/#post-16617251) * Please note that this error is only occurring with: * FPM application served by Apache. Proxy Mode enabled. * If I bypass Apache by disabling Proxy Mode and using “Dedicated FPM application served by nginx”, I don’t see the error. * Plugin Contributor [iSaumya](https://wordpress.org/support/users/isaumya/) * (@isaumya) * [3 years, 1 month ago](https://wordpress.org/support/topic/nginx-cron-directive-causing-loopback-error/#post-16620104) * Hi [@wykananda](https://wordpress.org/support/users/wykananda/), I understand your problem, but setting `"no-cache, no-store, must-revalidate, max-age=0` cache control header value for `wp-cron.php` requests are needed to ensure that those requests are never cached by Cloudflare CDN edge. * If the server level rule is causing issue, then I would suggest implementing the rule using Cloudflare Transform Rules. There you can go in the option of modify Response Header and then create a rule saying -> * if hostname equals to `example.com` (whatever your website domain is) and URI Path starts with `/wp-cron.php` then add the `cache-control` header with the value `no-cache, no-store, must-revalidate, max-age=0`. * In this way the entire header manipulation will happen on edge and you don’t need to have a server level rule for that. * Thread Starter [wykananda](https://wordpress.org/support/users/wykananda/) * (@wykananda) * [3 years, 1 month ago](https://wordpress.org/support/topic/nginx-cron-directive-causing-loopback-error/#post-16623533) * Hi [@isaumya](https://wordpress.org/support/users/isaumya/), * Thanks for your help. Setting up a Transform Rule indeed did fix the loopback error. However, it seemed like perhaps the issue was deeper. I was seeing _intermittent _504 errors being reported when updating wordpress pages in the editor. The update would timeout after 45 seconds or simply just take an awful long time to complete. I was going crazy trying to track down the cause. * When checking the PHP-FMP log, there was an error: * `PHP Fatal error:  Uncaught Error: Call to undefined function opcache_get_status() in /var/www/vhosts/katog.org/stage.sub/wp-content/plugins/wp-cloudflare-page- cache/libs/cache_controller.class.php:3157"` * I did a search in your forum and found this reference: [https://wordpress.org/support/topic/swcfpc_cache_purge_cron-error/](https://wordpress.org/support/topic/swcfpc_cache_purge_cron-error/) suggesting to turn off “Automatically purge the OPcache when Cloudflare cache is purged”. * Turning that option off made the PHP-FPM error go away. And it seemed to correct both the intermittent 504 error (yipee!) and the Loopback error too. * However, I do have OPCache enabled on the Plesk server. So, **would you know what would be causing “`opcache_get_status()`” error and how to correct it so the OPCache purge works?** I’m assuming I would want “Automatically purge the OPcache when Cloudflare cache is purged” enabled and working if it’s in use on the server. * Thanks for your help! A great plugin 🙂 * Plugin Contributor [iSaumya](https://wordpress.org/support/users/isaumya/) * (@isaumya) * [3 years, 1 month ago](https://wordpress.org/support/topic/nginx-cron-directive-causing-loopback-error/#post-16624830) * Hi, The `opcache_get_status` is a PHP Function: [https://www.php.net/manual/en/function.opcache-get-status.php](https://www.php.net/manual/en/function.opcache-get-status.php)– not sure why it is not available in Plesk. If it is not available in your system, you can disable that option inside the plugin. Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘Nginx Cron Directive causing Loopback Error’ is closed to new replies. * ![](https://ps.w.org/wp-cloudflare-page-cache/assets/icon-256x256.gif?rev=3234997) * [Super Page Cache – Cloudflare Cache, Page Speed & Core Web Vitals](https://wordpress.org/plugins/wp-cloudflare-page-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-cloudflare-page-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-cloudflare-page-cache/) * [Active Topics](https://wordpress.org/support/plugin/wp-cloudflare-page-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-cloudflare-page-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-cloudflare-page-cache/reviews/) ## Tags * [cron](https://wordpress.org/support/topic-tag/cron/) * [loopback](https://wordpress.org/support/topic-tag/loopback/) * [nginx](https://wordpress.org/support/topic-tag/nginx/) * [Plesk](https://wordpress.org/support/topic-tag/plesk/) * 4 replies * 3 participants * Last reply from: [iSaumya](https://wordpress.org/support/users/isaumya/) * Last activity: [3 years, 1 month ago](https://wordpress.org/support/topic/nginx-cron-directive-causing-loopback-error/#post-16624830) * Status: not resolved