I do a new installation in my server of Silverstripe v2.2.2 and I have this error:
The website server has not been able to respond to your request.
with Director::set_environment_type("dev"); command I see:
Disallowed action: 'db' on controller 'CMSMain'
This problem is also in other installation in silverstirpe in my server (installation about site that was ok)