Title: Error 500 on http header Last modified: August 20, 2016 --- # Error 500 on http header * [Andreas](https://wordpress.org/support/users/sauerland/) * (@sauerland) * [14 years, 4 months ago](https://wordpress.org/support/topic/error-500-on-http-header/) * I’m running WordPress in multisite mode with several subdomains. Everything is as it should but for one single subdomain. * There I keep getting an error 500 on the http header. The site itself is rendered normally, but search engine like Google and other non-human users don’t see anything. * This is the header: * > HTTP/1.0 500 Internal Server Error => > Date => Tue, 17 Jan 2012 19:30:44 GMT > Server => Apache X-Powered-By => W3 Total Cache/0.9.2.4 Expires => Tue, 17 > Jan 2012 19:32:15 GMT Last-Modified => Tue, 17 Jan 2012 19:30:45 GMT Cache- > Control => max-age=90, public, must-revalidate, proxy-revalidate Pragma => > public X-Pingback => [http://walburgisgymnasium.smmp.de/xmlrpc.php](http://walburgisgymnasium.smmp.de/xmlrpc.php) > Vary => Cookie,Accept-Encoding,User-Agent Connection => close Content-Type > => text/html; charset=UTF-8 * My provider (the site is on a dedicated server) says, there is nothing in the error logs and the error must be coming from a script. * They were as nice as to have a look at the scripts in my webspace and found these rather suspicious: * /wp-content/plugins/nextgen-gallery/admin/ajax.php: header(‘HTTP/1.1 500 Internal Server Error’); /wp-content/plugins/nextgen-gallery/admin/ajax.php: header(‘ HTTP/1.1 500 Internal Server Error’); * /wp-app.php: status_header(‘500’); /wp-includes/functions.php: status_header( 500 ); * I already dealt with NextGenGallery by deleting it completely from the server( funny enough, Highslide4WP is still announcing a conflict with NGG), but the error 500 is still there. I also deactivated the five other plugins running on that faulty site, but that didn’t change anything either. * My provider’s idea was a thorough debugging job on the scripts mentioned above. Unfortunately, that isn’t an option for me since I wouldn’t dare to touch those WP core file even if I had some foggy idea about debugging. * This error keeps the site from getting listed in search engines which is an absolute must and at least as urgent as food and drink. * So, any ideas that would rid me of that error are highly appreciated. Viewing 10 replies - 1 through 10 (of 10 total) * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [14 years, 4 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513084) * Did you flush the cache for w3TC on that site? * Thread Starter [Andreas](https://wordpress.org/support/users/sauerland/) * (@sauerland) * [14 years, 4 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513092) * I flushed the cache every time I tried something new and even deactivated w3tc completely. Didn’t change anything. * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [14 years, 4 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513177) * Well the usual tricks are to turn off all your plugins and see it works. * [Frederick Townes](https://wordpress.org/support/users/fredericktownes/) * (@fredericktownes) * [14 years, 3 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513456) * Removing the .htaccess directives for page cache resolves the issue? * Thread Starter [Andreas](https://wordpress.org/support/users/sauerland/) * (@sauerland) * [14 years, 3 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513457) * I don’t know. Got it running again after killing NextGen Gallery multisite-wide. The error disappeard and didn’t come back when I reinstalled the gallery plugin. Very obscure. * [Frederick Townes](https://wordpress.org/support/users/fredericktownes/) * (@fredericktownes) * [14 years, 3 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513458) * Any chance you have specific steps to duplicate? * Thread Starter [Andreas](https://wordpress.org/support/users/sauerland/) * (@sauerland) * [14 years, 3 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513461) * If something like this occurs I usually try so many things in fast sequence that I finally don’t know what did the trick. There is one thing, though, that really troubles me in these erratic fault finding fits: The backend is being cached – no matter what the plugin claims not to do. On a multisite a newly installed or deactivated plugin only shows when I flush the cache on the network AND on the individual site. Same goes with changes taking effect. Some things fall into perfect harmony a day later (provided I bit the dust in the meantime and didn’t go on with my untutored fiddlings). * [Frederick Townes](https://wordpress.org/support/users/fredericktownes/) * (@fredericktownes) * [14 years, 3 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513472) * So you’re using object caching? * Thread Starter [Andreas](https://wordpress.org/support/users/sauerland/) * (@sauerland) * [14 years, 3 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513473) * Yes, with APC. * [Frederick Townes](https://wordpress.org/support/users/fredericktownes/) * (@fredericktownes) * [13 years, 10 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513536) * That’s likely the issue. Improved compatibility is amount the goals in the forthcoming release. Viewing 10 replies - 1 through 10 (of 10 total) The topic ‘Error 500 on http header’ is closed to new replies. ## Tags * ["internal server error"](https://wordpress.org/support/topic-tag/internal-server-error/) * [ajax.php](https://wordpress.org/support/topic-tag/ajax-php/) * [debugging](https://wordpress.org/support/topic-tag/debugging/) * [error 500](https://wordpress.org/support/topic-tag/error-500/) * [multisite](https://wordpress.org/support/topic-tag/multisite/) * [next-gen gallery](https://wordpress.org/support/topic-tag/next-gen-gallery/) * [subdomain](https://wordpress.org/support/topic-tag/subdomain/) * [wp-includes/functions.php](https://wordpress.org/support/topic-tag/wp-includesfunctions-php/) * In: [Networking WordPress](https://wordpress.org/support/forum/multisite/) * 10 replies * 3 participants * Last reply from: [Frederick Townes](https://wordpress.org/support/users/fredericktownes/) * Last activity: [13 years, 10 months ago](https://wordpress.org/support/topic/error-500-on-http-header/#post-2513536) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics