I have just upgraded my NAS (TS269L) to firmware 4.0.1 as prompted by the NAS itself. Ever since the webserver returns the 403-Forbidden page on all virtual hosts. There have been no other changes (in privs or whatever prior to the upgrade).
I have also checked that the admin user has access to the 'Web' share.
When opening other apps (like PHPMyAdmin) the exact same issue occurs (403-Forbidden). Apps that do not run on ...