Find - Error "The Find user interface is currently not available, please try again later."

If you are seeing this error message when trying to access the Find tab in the CMS UI.
"The Find user interface is currently not available, please try again later."

This error is shown when the browser can't connect and fetch the javascript/css resources needed for the Find UI, usually delivered from dl.episerver.net but can also be hosted on the website if necessary.

It's most likely caused by one of the following

* Adblocker plugins in browsers that blocks access to dl.episerver.net
* Locked down environment - No access to dl.episerver.net because of firewall rules?
* Content Security Policy (CSP) blocking dl.episerver.net
* In some rare cases the address for the dl.episerver.net resources has been overridden using the clientSideResourceBaseUrl key in your web.config - with a non valid one