My Drupal 8 installation is in a subfolder: domain.com/subfolder. The theme installed fine but saving theme settings gives following error on a blank white screen:

Forbidden

You don't have permission to access /domain/admin/appearance/settings/bootstrap on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

Comments

cmwelding created an issue. See original summary.

markcarver’s picture