How to get WP-Super-Cache working on WordPress MU

(I know it’s not called MU anymore, but lets just roll with it.)

At the time of this article I was working with:
WP-Super-Cache version: 0.9.9.6
WordPress version: 3.0.1

I fought for over an hour trying to get WP-Super-Cache working properly on my WordPress install, I hope that this can help you fix yours sooner than I did.

I followed the instructions on WP-Super-Cache’s installation page, but had to do one thing from their troubleshooting section in the FAQs page, too.

  1. I did have to download the plugin manually. Don’t attempt to use the built in plugin installers because they’ll put it in the wrong place.
  2. When you install the plugin, you’ll need to put it into the /wp-content/mu-plugins/ directory. You don’t install anything into the /wp-content/plugins/ directory.
  3. Copy the wp-cache-config-sample.php from the /wp-content/mu-plugins/wp-super-cache/ directory into the /wp-content/ directory. Rename it to wp-cache-config.php. On line 19, change the path from “/plugins/wp-super-cache/” to “/mu-plugins/wp-super-cache/”.
  4. Copy the advanced-cache.php from the /wp-content/mu-plugins/wp-super-cache/ directory into the /wp-content/ directory. On lines 8 and 9, change ‘CACHEHOME’ to ┬áthe path of your wp-super-cache directory where the path is the complete path from the root. Mine was ‘/home/<site name>/public_html/wp-content/mu-plugins/wp-super-cache/’

That should help you along your way. WP-Super-Cache was very good at guiding me through the troubleshooting process. There was guidance on editing .htaccess files and setting permissions.

I used the FileZilla ftp client to handle the file transfers and file editing. (I actually use FileZillaPortable) You can view hidden files by clicking on Server -> Force showing hidden files from the menu bar; this allows you to see the .htaccess files. You can also change file and folder permissions from inside FileZilla just as WP-Super-Cache asks you to.

Another semi-helpful post I found was Austin Gulati’s Using the WP Super Cache Plugin.

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