Changing the /Umbraco/ folder to /something-secure/ looses the styling in the back-office

In 8.4.0, when I rename the /Umbraco/ folder to /something-secure/, (and make the changes in web.config) I lose all the styling in the back-office. Copying the folder works, as the referenced /Umbraco/ folder is still there.

Umbraco version

I am seeing this issue on Umbraco version: 8.4.0

Reproduction

Bug summary

When renaming the /Umbraco/ directory to something else, e.g. /something-secure/, and make the changes in the web.config file, the back-office still requires the /Umbraco/ directory to be present. E.g. for <link href="/umbraco/assets/css/umbraco.css?cdv=666268331" type="text/css" rel="stylesheet">

Specifics

This occurs in all back-office pages. E.g. https://nysite.localtest.me/something-secure/#/content/content/edit/2295 I am using 8.4.0 - occurs on all browsers

Steps to reproduce

[I installed v8.2.0, upgraded to 8.3.0, then 8.4.0] Do exactly as described in https://our.umbraco.com/documentation/Reference/Security/Security-hardening/

1. Rename the folder /Umbraco/ to /something-secure/
2. Update the web.config folder to

    <add key="Umbraco.Core.ReservedUrls" value="~/something-secure" />
    <add key="Umbraco.Core.ReservedPaths" value="~/something-secure" />
    <add key="Umbraco.Core.Path" value="~/something-secure" />

Expected result

All references in the html file od the back-office go to the /something-secure/ folder e.g. <link href="/something-secure/assets/css/umbraco.css?cdv=666268331" type="text/css" rel="stylesheet">

Actual result

The first 3 href references still fo to the /umbraco/ folder e.g. <link href="/umbraco/assets/css/umbraco.css?cdv=666268331" type="text/css" rel="stylesheet">

[stevemegson]

The problem is that we have two ways to access the name of the /Umbraco/ directory.

• GlobalSettings.Path reads the Umbraco.Core.Path value from appSettings
• SystemDirectories.Umbraco is still looking for umbracoPath.

As a temporary workaround, adding the extra key to appSettings should work:

<add key="umbracoPath" value="~/something-secure" />

[nul800sebastiaan]

Fixed in https://github.com/umbraco/Umbraco-CMS/pull/7440