Title: Mysterious errors in error logs Last modified: May 21, 2019 --- # Mysterious errors in error logs * Resolved [jjchibwana](https://wordpress.org/support/users/jjchibwana/) * (@jjchibwana) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/) * Hello, it’s been a few months (maybe going back as far as February) that I have been seeing these errors in the logs. Can’t quite figure out what’s going on. Here are the error messages: * ``` [21-May-2019 06:15:08 UTC] Error checking in buffer: The buffer you checked in was not checked out [21-May-2019 06:15:08 UTC] Error checking in buffer: There are no checked out buffers [21-May-2019 06:19:33 UTC] Error checking in buffer: The buffer you checked in was not checked out [21-May-2019 06:20:39 UTC] Error checking in buffer: The buffer you checked in was not checked out [21-May-2019 06:24:25 UTC] Error checking in buffer: The buffer you checked in was not checked out [21-May-2019 06:25:40 UTC] Error checking in buffer: The buffer you checked in was not checked out ``` * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fmysterious-errors-in-error-logs%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 11 replies - 1 through 11 (of 11 total) * Plugin Support [KokkieH](https://wordpress.org/support/users/kokkieh/) * (@kokkieh) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11554294) * Hi there, * Can you tell me in which log you’re seeing this? Is it your server logs, the Jetpack debug logs, somewhere else? And are those the full errors, or can they be expanded to give additional information? * Those errors come from Jetpack’s sync feature, but we can’t really say what’s causing them without some more info. Are you noticing any Jetpack features on your site that aren’t working? If you access Jetpack settings via the WordPress. com interface, are all options accessible to you? * One possible cause of this error is a problem with your nginx configuration. Could you check this post, and compare it against your own configuration? [https://gist.github.com/magnetikonline/11312172](https://gist.github.com/magnetikonline/11312172) * Thread Starter [jjchibwana](https://wordpress.org/support/users/jjchibwana/) * (@jjchibwana) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11554342) * We’re using Apache. The errors are in the server log files and those are the full errors. * Opening Jetpack on wordpress.com, everything looks fine. I, however, got a toast with this message: “Something went wrong.” and a visit site link. It happened after a refresh of the page as well. The page was [https://wordpress.com/settings/security/iharare.com](https://wordpress.com/settings/security/iharare.com) i.e the default settings page. * Plugin Support [KokkieH](https://wordpress.org/support/users/kokkieh/) * (@kokkieh) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11554432) * `/settings/security` is in fact not the default settings page – that’s `/settings/ general`, so that might indicate an issue specifically with Jetpack’s security features/settings. * In a previous case we had with this, the problem turned out to be Sucuri’s firewall blocking our API from making calls to the site. Are you perhaps using Sucuri or any similar service? * And just to confirm, you are able to change all the settings on that page? Nothing is greyed out or unresponsive if you try to change it? * Thread Starter [jjchibwana](https://wordpress.org/support/users/jjchibwana/) * (@jjchibwana) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11554660) * Sorry, I actually got that toast on both pages. Now that you mention it, all the toggles are greyed out, except “Show publish confirmation” under Composing and the “Change Timezone” select field. Other settings like Import and Export take me to the website. * We are currently not using any firewall service. * Plugin Support [darnelldibbles](https://wordpress.org/support/users/darnelldibbles/) * (@darnelldibbles) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11556501) * Hi there, * Although we are not certain that the errors that you are receiving are related to the Jetpack plugin, we noticed that your [JSON API](https://jetpack.com/support/json-api/) module is off. Here are instructions on how to turn that module back on: * [https://jetpack.com/support/control-jetpacks-modules-on-one-page/](https://jetpack.com/support/control-jetpacks-modules-on-one-page/) * Please turn it back on and let us know if that makes a difference. * Thanks, * Thread Starter [jjchibwana](https://wordpress.org/support/users/jjchibwana/) * (@jjchibwana) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11559552) * Hi there, I have been getting a 403 401 page at [https://iharare.com/wp-json](https://iharare.com/wp-json). The response says that the JSON API is deactivated. Is this the same JSON API? * Meantime, I have activated the Jetpack Module, I will check the logs and get back to you. - This reply was modified 6 years, 12 months ago by [jjchibwana](https://wordpress.org/support/users/jjchibwana/). * Plugin Support [darnelldibbles](https://wordpress.org/support/users/darnelldibbles/) * (@darnelldibbles) * [6 years, 12 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11559944) * > Hi there, I have been getting a 403 401 page at [https://iharare.com/wp-json](https://iharare.com/wp-json). > The response says that the JSON API is deactivated. Is this the same JSON API? * Yes, that is the same JSON API. Let us know what you find. * Thanks, * Thread Starter [jjchibwana](https://wordpress.org/support/users/jjchibwana/) * (@jjchibwana) * [6 years, 11 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11574755) * Hi there, checked the error logs and the errors are still appearing. Maybe this is related to the issue, this error is also being output in the logs: * ``` [26-May-2019 22:59:10 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/ihararecom/public_html/wp-includes/embed.php:743) in /home/ihararecom/public_html/wp-includes/rest-api.php on line 588 [26-May-2019 22:59:10 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/ihararecom/public_html/wp-includes/embed.php:743) in /home/ihararecom/public_html/wp-includes/rest-api.php on line 589 [26-May-2019 22:59:10 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/ihararecom/public_html/wp-includes/embed.php:743) in /home/ihararecom/public_html/wp-includes/rest-api.php on line 590 ``` * Plugin Support [KokkieH](https://wordpress.org/support/users/kokkieh/) * (@kokkieh) * [6 years, 11 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11575168) * `/home/ihararecom/public_html/wp-includes/rest-api.php` refers to the WordPress REST API, which is part of WordPress itself, not Jetpack. * [https://developer.wordpress.org/rest-api/](https://developer.wordpress.org/rest-api/) * It doesn’t look like there’s a setting in WordPress that can disable that, but there are plugins that can be used to disable it, and even some themes that disable the API by default. * Please try disabling all plugins on your site except Jetpack, and switch to the Twenty Nineteen theme, and see if the errors go away. You can also check if [https://iharare.com/wp-json](https://iharare.com/wp-json) now shows your homepage URL rather than the “Disabled” message. * If that works, then you can re-enable your theme and other plugins one at a time until it breaks again to see which one is responsible for disabling the API. * Thread Starter [jjchibwana](https://wordpress.org/support/users/jjchibwana/) * (@jjchibwana) * [6 years, 9 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11833924) * Hi, still getting the “Error-checking in buffer” errors. Turned on the JSON API in Jetpack, turned on the WP REST API (which had been turned off in W3 Total Cache) and still, the errors persist. I went to wordpress.org to check on Jetpack Sync and it says everything is in order and I also launched “Diagnose a connection problem ” and nothing was found. * Plugin Contributor [James Huff](https://wordpress.org/support/users/macmanx/) * (@macmanx) * [6 years, 9 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11839895) * Did you try the steps mentioned above? Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘Mysterious errors in error logs’ is closed to new replies. * ![](https://ps.w.org/jetpack/assets/icon.svg?rev=2819237) * [Jetpack - WP Security, Backup, Speed, & Growth](https://wordpress.org/plugins/jetpack/) * [Frequently Asked Questions](https://wordpress.org/plugins/jetpack/#faq) * [Support Threads](https://wordpress.org/support/plugin/jetpack/) * [Active Topics](https://wordpress.org/support/plugin/jetpack/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/jetpack/unresolved/) * [Reviews](https://wordpress.org/support/plugin/jetpack/reviews/) * 11 replies * 4 participants * Last reply from: [James Huff](https://wordpress.org/support/users/macmanx/) * Last activity: [6 years, 9 months ago](https://wordpress.org/support/topic/mysterious-errors-in-error-logs/#post-11839895) * Status: resolved