Redis Server & Formidable Forms – Unrecoverable Site Crash

  • Resolved saltyruss

    (@saltyruss)


    3 years, 5 months ago

    Hi,

    I have been using the Redis Object Cache, and it has performed really well.

    However, when I reached out to Formidable Forms Support for help on forms that are not formatted correctly on the front end, Formidable Forms support logged into my site and disabled your plugin. The result was catastrophic. It displays HTTP ERROR 500 no matter what we do. We cant access the front end or the back end; nothing works. We have tried database repair/rebuild, several WP-CLI recovery options, everything. Even backups don’t restore due to the “inability to overwrite files”.

    If you could share some trade tricks to help me get the site going again, I would greatly appreciate it.

    The page I need help with: [log in to see the link]

Viewing 4 replies - 1 through 4 (of 4 total)
  • Plugin Author Till Krüss

    (@tillkruess)

    Hi @saltyruss!

    Yikes, that sounds terrible. I’ve got a dozen questions, but let’s start with the essentials.

    To fully remove Redis from your site all you need to do is delete the /wp-content/object-cache.php file. If you site is still broken after that it is unrelated to Redis.

    If you re-enabled Redis after their support team turned it off, you MUST do a full Redis cache flush, otherwise your Redis and MySQL are out of sync.

    Lastly, can you post your log files that lists the reasons for the 500 error?

    Thread Starter saltyruss

    (@saltyruss)

    Hi,
    Thanks. I got the site back up to where it was a few hours before the crash. The Redis server is running. The Redis Object Cache plugin is disabled.

    The only locations where the object-cache.php file resides are listed below:

    /public_html/wp-content/plugins/redis-cache/includes/object-cache.php
    /public_html/wp-includes/class-wp-object-cache.php
    /public_html/tmp/object-cache.php
    /public_html/tmp/plugins/redis-cache/includes/object-cache.php
    /public_html/tmp/plugins/debug-bar/panels/class-debug-bar-object-cache.php
    /public_html/tmp/wp-includes/class-wp-object-cache.php

    I want to enable Redis Object Cache again. Do you have some instructions to help ensure I don’t cash again?

    Formidable Forms stated: “It seems like the “Redis Object Cache” plugin is your issue – as soon as I deactivated it, your form displayed correctly.
    There may be settings within this plugin that allow it to be active and still have your Forms working correctly – I’d recommend reaching out to their support team if you can’t find anything obvious that works for you, though.”

    Thanks,
    Russ

    Plugin Author Till Krüss

    (@tillkruess)

    Hi Russ!

    Yeah, you can re-enable the cache under Settings > Redis.

    However I’d strongly recommend to flush your entire Redis Server before enabling it using redis-cli flushall.

    As for the form not being displayed correctly: That’s an issue with Formidable Form and something they have to fix on their end. My guess is they don’t use the object cache or transient API correctly.

    I know this is old, but I just wanted to add for anybody reading this that I use this Redis plugin with Formidable Forms all the time and no issue. Sounds like there might be something else going on with the OP’s environment.

Viewing 4 replies - 1 through 4 (of 4 total)
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