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I can not open the admin panel and get a 404.

The $this->_routerList does not contain the admin route.

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Have a look at \Magento\Framework\App\Http::launch. There is a line

    $areaCode = $this->_areaList->getCodeByFrontName($this->_request->getFrontName());

which determines the area.

The admin route is only loaded, if the area is detected as adminhtml.

Digging down leads you to \Magento\Backend\App\Area\FrontNameResolver::isHostBackend

There is a check whether the current URL (unsecure URL or custom_admin_url) matches the current host.

In cases where this does not match (for example if behind a proxy), this might fail.

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