Admin in an iFrame

Hi everybody,

I’ve some problems with WordPress and display the admin panel in an iframe. In the past I was able to access the admin panel through an iFrame from a different URL (https) than the blog itself. Since I updated to the latest version it is not possible any more, but hopefully I’ll get some help.

To be sure that no plugin is interfering I installed a fresh empty blog. Within the same URL I can access the admin area through an iFrame, fine. From a different URL I just get an empty white page.

Modifying default-filters.php (line 258) to:

//add_action( 'admin_init', 'send_frame_options_header', 10, 0 );

is not working like in the past.

I assume it’s because of implementing X-Frame-Options. So I tried to modify functions.php (line 3515) to:

@header( 'X-Frame-Options: ALLOW-FROM https://myDomain.net' );

but as well without success.

So my question: Is there any possibility to access the admin panel through an iFrame?
And yes, I know of the security problems. That’s why I wanted to modify the X-Frame settings..

All the best
– vougie