Why does Nginx return a 403 even though all permissions are set properly?

Question

I have Nginx setup and displaying the test page properly. If I try to change the root path, I get a 403 Forbidden error, even though all permissions are identical. Additiona

Answer 1

I was using:

sudo service nginx start

If I use:

sudo nginx 

...everything works fine. Can anyone explain the difference between these two?