Title: Error when activating obeject cache
Last modified: October 27, 2021

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# Error when activating obeject cache

 *  Resolved [Regenpfeifer](https://wordpress.org/support/users/regenpfeifer/)
 * (@regenpfeifer)
 * [4 years, 5 months ago](https://wordpress.org/support/topic/error-when-activating-obeject-cache/)
 * Hello,
 * I am using the Redis-Plugin on two different websites, both on the same server
   with the same WordPress-Theme and a similar set of plugins.
 * Redis is running in Debian 10, **systemctl service redis** is showing me, that
   the Redis service is up and running. I also have flushed the cache with redis-
   cli.
 * Nevertheless I have the problem, that activating the object-cache / drop-in (
   object-cache.php) is causing the following error:
 * Service Unavailable
    ** The server is temporarily unable to service your request
   due to maintenance downtime or capacity problems. Please try again later.
 * The website is unavailable until I am removing object-cache.php.
 * I am getting this error on one of my websites permanently, the other site is 
   running with redis drop-in activating, but sometimes I am also getting an error.
 * On the same server I had an obsolete WordPress-site which was running the Redis
   plugin without any problems.
 * If Redis plugin is running I am getting these diagnostics:
 *     ```
       Status: Verbunden
       Client: PhpRedis (v5.3.4)
       Drop-in: Valid
       Disabled: No
       Ping: 1
       Errors: []
       PhpRedis: 5.3.4
       Predis: Not loaded
       Credis: Not loaded
       PHP Version: 8.0.12
       Plugin Version: 2.0.21
       Redis Version: 5.0.3
       Multisite: No
       Metrics: Enabled
       Metrics recorded: 2
       Filesystem: Working
       Global Prefix: "xxx_"
       Blog Prefix: "xxx_"
       Global Groups: [
           "blog-details",
           "blog-id-cache",
           "blog-lookup",
           "global-posts",
           "networks",
           "rss",
           "sites",
           "site-details",
           "site-lookup",
           "site-options",
           "site-transient",
           "users",
           "useremail",
           "userlogins",
           "usermeta",
           "user_meta",
           "userslugs",
           "redis-cache",
           "blog_meta"
       ]
       Ignored Groups: [
           "counts",
           "plugins",
           "themes"
       ]
       Unflushable Groups: []
       Drop-ins: [
           "Redis Object Cache Drop-In v2.0.21 by Till Krüss"
       ]
       ```
   
 * I have also tried to deactivate all other plugins except redis, without success.
 * What could I do to find the reason of this problems?
 * Thank you very much in advance!
    -  This topic was modified 4 years, 5 months ago by [Regenpfeifer](https://wordpress.org/support/users/regenpfeifer/).
    -  This topic was modified 4 years, 5 months ago by [Regenpfeifer](https://wordpress.org/support/users/regenpfeifer/).
    -  This topic was modified 4 years, 5 months ago by [Regenpfeifer](https://wordpress.org/support/users/regenpfeifer/).
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-when-activating-obeject-cache%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/)
 * (@tillkruess)
 * [4 years, 5 months ago](https://wordpress.org/support/topic/error-when-activating-obeject-cache/#post-15013170)
 * Hi!
 * I’d strongly suggest using different `WP_REDIS_DATABASE` indices for each site
   and flushing the entire server using `FLUSHALL`.
 * If that doesn’t fix it, please post your PHP error logs, since…
 * > The server is temporarily unable to service your request due to maintenance
   > downtime or capacity problems. Please try again later.
 * is just a generic error page and doesn’t tell us much.
 *  Thread Starter [Regenpfeifer](https://wordpress.org/support/users/regenpfeifer/)
 * (@regenpfeifer)
 * [4 years, 5 months ago](https://wordpress.org/support/topic/error-when-activating-obeject-cache/#post-15013223)
 * Thank you very much, Till.
 * It seems that using different `WP_REDIS_DATABASES` fixed the problem!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Error when activating obeject cache’ is closed to new replies.

 * ![](https://ps.w.org/redis-cache/assets/icon-256x256.gif?rev=2568513)
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 * 2 replies
 * 2 participants
 * Last reply from: [Regenpfeifer](https://wordpress.org/support/users/regenpfeifer/)
 * Last activity: [4 years, 5 months ago](https://wordpress.org/support/topic/error-when-activating-obeject-cache/#post-15013223)
 * Status: resolved