TYPO3 Core

idem with 11.3.0

Got the completely same problem with 11.3.0

My problem was that i called the TYPO3 path via ip/folder (192.168.0.1/mytypo3.t3) and the solution is that is has to be a domain to the projectfolder now (example.com points directly to mytypo3.t3).

I modified a domain in my local host file and redirected that domain to the folder on my vm, for our hosted server i dedicated a subdomain and both projects are now working as intended.

on the same server opensuse 15.3 switching between Typo3 10.4.16 and 11.3.1 by only changing the typo3_src link

typo3/install OK
typo3 FE OK
typo3 BE error as above only on 11.3.1 even with a new administrative user created by 11.3.1 install admin tool.

Same here.
TYPO3 11.2.0 and TYPO3 11.3.1 tested
BE-Login works with DDEV
But not at my provider (nginx with PHP 7.4 and 8.0 tested)
Installtool works

same here. In the rewritecond in the .htaccess file, removing the ^character before typo3 works, but that would probably mean that if you have a page called typo3 somewhere in the pagetree, it would try to route it to the backend...

Not sure if there is a way to make it work for subdirectories without manual configuration. Tried to use the cwd variable, but apparently thats not possible in the CondPattern part..

For now i just added the subdirectory path to the Cond Pattern

so instead of
RewriteCond %{REQUEST_URI} ^/typo3/.$*

you can write
RewriteCond %{REQUEST_URI} ^/SUBDIR/typo3/.$*

Same here with TYPO3 11.3.3
I don't installed it in a subdirectory. Provider: Timmehosting
Locale in DDEV it works fine.
It would be good to know, where the URL .../typo3/login?loginProvider=1433416747 come from.
The file or folder '/typo3/login' does not exist. Strange.

Solution: fix your rewrite rules, see: https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/11.0/Breaking-93048-BackendURLRewrites.html

Would it be possible to provide the Rewrite also for IIS?

Making a copy from
typo3/sysext/install/Resources/Private/FolderStructureTemplateFiles/root-htaccess
to [WEB-ROOT]/.htaccess
solves the issue without looking in the details.

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/71422

Patch set 3 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/71422

Dominik Weber wrote in #note-10:

Solution: fix your rewrite rules, see: https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/11.0/Breaking-93048-BackendURLRewrites.html

thanks, worked for me