403

403 stands for permission numbers in binary. Owner, Group, and World in that order stand for the numbers 4 0 and 3 When translated to binary this is what the numbers mean r w x 4 -- 1 0 0 0 -- 0 0 0 3 -- 0 1 0 r -- read w -- write x -- execute If its a zero, means you don't have the permission to do that particular task. So, that means is theres a 0 in the r column you cannot read that file. As you can see from the r column in a 403 code, NO one has permission to read it except the owner (4). The group(0) and the rest of the world(3) both are denied access to this particular file.