[Bug / Issue] Incorrect user and redirect paths

[Cruisey]

We have installed vbulletin on server A. Server B is configured to use /forum/ which /forum/ points to Server A. Our vBulletin URL and Login URL are as follows:

// vBulletin URL
https://www.example.com/forum
// core
https://www.example.com/forum/core

Everything seems to work. When an admin is on an user profile page and clicks the edit button (that pencil), it takes us to the admincp but displays a blank page. The error is that of mixed content, the page is trying to load:

// in console, it's blocking:
http://www.example.com/admincp/user.php?do=edit&u=<userid>

Two things here:

1. It's loading http instead of https
2. where is the /forum/

I cannot think of a setting to change. In our .htaccess file, if I uncomment:

# RewriteBase /forum/

our site breaks. Was that really meant to be uncommented and sort the error it faces when uncommented?

[LockedOnLaw]

Add the following to your headinclude template:

<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">

Does that remedy the mixed content error?

You have modified your software so much it is impossible to know what to do about the routing without actually looking at it.

[Mark.B]

You may recall we mentioned some time ago that you should not edit the php files that handle routing. This is exactly the sort of reason why.

You should take a backup of the files and database and restore a complete set of default files.

[Cruisey]

Sorry but nothing to do with that file: routing.php. I've also reverted all changes and same issue. Before I ask questions, I revert all changes.

[Wayne Luke]

Go to Settings -> Options -> Site Name / URL / Contact Details. Make sure that Always use Forum URL as Base Path is set to Yes.