TYPO3 now returns a HTTP 403 status code, when BE.adminOnly is
configured or when the clients IP address does not match the
configured BE.IPmaskList.

Additionally, TYPO3 will now present a proper system message
instead of showing the default "Oops, an error occurred!".

Resolves: #93379
Releases: master, 10.4
Change-Id: I409a514852b25c2891eade71bd61f50e25ffc174
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67546


Tested-by: Richard Haeser <richard@richardhaeser.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Richard Haeser <richard@richardhaeser.com>
Reviewed-by: Benni Mack <benni@typo3.org>