Note: I struggled with making this work for a while, so I’m mostly posting this as a reminder to myself for the next time I need to do it.
If you’re running WordPress Multisite with a self-signed SSL certificate–such as on a local development site–you’ve likely seen an SSL error when trying to upgrade your network after a WordPress upgrade. In order to work around this, create a file in your
wp-content/mu-plugins directory1–I called mine
network_upgrade_fix.php— and put the following in it:
Save the file and run the network upgrade again and it should work.
- You may have to create this directory if it doesn’t exist already. ↩