Title: [Plugin:  WP Super Cache] Server Error
Last modified: August 20, 2016

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# [Plugin: WP Super Cache] Server Error

 *  [cheezitman](https://wordpress.org/support/users/cheezitman/)
 * (@cheezitman)
 * [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/)
 * At my site [students.scisdragons.net](http://students.scisdragons.net) I recently
   put in WP Super Cache. It seems to be working ok, except that occasionally I 
   get in Chrome:
 *     ```
       Server error
       The website encountered an error while retrieving http://students.scisdragons.net/wp-admin/network/sites.php. It may be down for maintenance or configured incorrectly.
       Here are some suggestions:
       Reload this webpage later.
       HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.
       ```
   
 * I refresh the screen, and it’s gone. I don’t see anything in the apache error
   log. What should I be looking for. I’m using Ubuntu Server and Apache 2.
 * [http://wordpress.org/extend/plugins/wp-super-cache/](http://wordpress.org/extend/plugins/wp-super-cache/)

Viewing 6 replies - 1 through 6 (of 6 total)

 *  Thread Starter [cheezitman](https://wordpress.org/support/users/cheezitman/)
 * (@cheezitman)
 * [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/#post-2616101)
 * Hmmm…. seems there’s a problem with
 *     ```
       08:05:12 /kapm50927 Cookie detected: wordpress_logged_in_7efd1b1668d8164ea22947efcf3d8fed
       08:05:12 /kapm50927 supercache dir: /home/www/hdb/students.scisdragons.net/wp-content/cache/supercache/students.scisdragons.net/kapm50927/
       08:05:12 /kapm50927 No wp-cache file exists. Must generate a new one.
       08:05:13 /kapm50927 Cookie detected: wordpress_logged_in_7efd1b1668d8164ea22947efcf3d8fed
       08:05:13 /kapm50927 In WP Cache Phase 2
       08:05:13 /kapm50927 Setting up WordPress actions
       08:05:13 /kapm50927 Created output buffer
       08:05:13 /kapm50927 Cookie detected: wordpress_logged_in_7efd1b1668d8164ea22947efcf3d8fed
       08:05:13 /kapm50927/wp-cron.php?doing_wp_cron=1331193913 In WP Cache Phase 2
       08:05:13 /kapm50927/wp-cron.php?doing_wp_cron=1331193913 Setting up WordPress actions
       08:05:13 /kapm50927/wp-cron.php?doing_wp_cron=1331193913 Not caching POST request.
       08:05:13 /kapm50927 Output buffer callback
       08:05:13 /kapm50927 Buffer is blank. Output buffer may have been corrupted by another plugin or this is a redirected URL. Look for text 'ob_start' in the files of your plugins directory.
       08:05:13 /kapm50927 No closing html tag. Not caching.
       08:05:13 /kapm50927 wp_cache_shutdown_callback: collecting meta data.
       08:05:13 /kapm50927 Did not write meta file: wp-cache-blog1c4e2ea680e65cb0f0168896513d69b1.meta ** *0* **
       ```
   
 * The Buffer being blank….
 *  Plugin Author [Donncha O Caoimh (a11n)](https://wordpress.org/support/users/donncha/)
 * (@donncha)
 * [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/#post-2616111)
 * cheezitman – the sites 500 internal error might be an out of memory error.
 * The blank buffer isn’t related I think. That happens on front facing pages, not
   the backend.
 *  Thread Starter [cheezitman](https://wordpress.org/support/users/cheezitman/)
 * (@cheezitman)
 * [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/#post-2616113)
 * What can I do about the out of memory error. It’s not showing up in the Apache
   logs?
 * Normally if I refresh the page the blog loads, it’s just showing this on the 
   first visit.
 *  Thread Starter [cheezitman](https://wordpress.org/support/users/cheezitman/)
 * (@cheezitman)
 * [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/#post-2616115)
 * I did try deactivating all the plugins except caching… didn’t help.
 *  Thread Starter [cheezitman](https://wordpress.org/support/users/cheezitman/)
 * (@cheezitman)
 * [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/#post-2616248)
 * What can I do about this? Any other places I should look.
 * This is a longer list of the debug log from wp super cache. It’s definitely the
   caching, but I’m at a loss on how to fix it.
 *     ```
       01:18:20 /gilo55856/tag/tup/ No wp-cache file served as user agent rejected.
       01:18:20 /gilo55856/tag/tup/ In WP Cache Phase 2
       01:18:20 /gilo55856/tag/tup/ Setting up WordPress actions
       01:18:20 /gilo55856/tag/tup/ USER AGENT (Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)) rejected. Not Caching
       01:18:20 /wp-cron.php?doing_wp_cron=1331255900 In WP Cache Phase 2
       01:18:20 /wp-cron.php?doing_wp_cron=1331255900 Setting up WordPress actions
       01:18:20 /wp-cron.php?doing_wp_cron=1331255900 Not caching POST request.
       01:18:20 /wp-cron.php?doing_wp_cron=1331255900 Cache garbage collection.
       01:18:20 /wp-cron.php?doing_wp_cron=1331255900 Cleaning expired cache files in /home/www/hdb/students.scisdragons.net/wp-content/cache/blogs/blog/
       ```
   
 * [Large amount of log data trimmed by moderator per [forum rules](http://codex.wordpress.org/Forum_Welcome#Posting_Code).
   Please use [the pastebin](http://wordpress.pastebin.com/) for all large code 
   excerpts. It works better anyway.]
 *  Thread Starter [cheezitman](https://wordpress.org/support/users/cheezitman/)
 * (@cheezitman)
 * [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/#post-2616262)
 * I’ve also attached my memory usage graph to [here](http://www.learning2.asia/memory.png)

Viewing 6 replies - 1 through 6 (of 6 total)

The topic ‘[Plugin: WP Super Cache] Server Error’ is closed to new replies.

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 * 6 replies
 * 2 participants
 * Last reply from: [cheezitman](https://wordpress.org/support/users/cheezitman/)
 * Last activity: [14 years, 3 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-9/#post-2616262)
 * Status: not resolved