Support » Plugin: W3 Total Cache » Error 500 when purging cache

  • Hello,

    First – thank you for a great plugin!
    Second – lately I’m getting error 500 when trying to purge cache. I’ve tried to pinpoint the problem, and it seems to be only happening when I use an option purging the page cache (purging disk cache or opcache doesn’t result in error 500). Purging all cachge, page cache or all cache except cloudflare (I’ve also tried to manually clear CF’s cache on their site with no vail) results in error 500.

    Any idea?

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

Viewing 5 replies - 1 through 5 (of 5 total)
  • Either implement the following fix below, or revert to the previous version, until the developer fixes the problem.

    Thread Starter wpkiller


    Thank you.
    Indeed there’s no error 500 anymore, but I do get the following error on the top of wp-admin’s dashboard:

    Failed to flush: unknown engine

    Is that known?

    Yeah it is. At least you don’t get any error 500. Myself I haven’t updated the plugin yet. You could revert to the previous version if you like.

    Hi all
    I was having the same issue for a long time
    Just fixed it by changing the following code:

    You can change the following from w3tc config file :
    so my location is like this

    or you can locate the file y
    <WordPress folder>/wp-content/w3tc-config/master.php

    “cdnfsd.enabled”: “0”,
    “cdnfsd.engine”: “”, //you can change according to your cdn
    “cdnfsd.debug”: “0”,

    Make the ‘cdnfsd.enabled’ value ‘0’



    FYI- This is also the “fix” if you get 500 error’s when trying to save pages and posts.

    This is due to the “FSD CDN:” portion of W3 Total Cache where it’s greyed out as “enabled” it looks like. Modifying that file disables it. Still shows up as enabled though, but you can ignore until there’s an update.

Viewing 5 replies - 1 through 5 (of 5 total)
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