You started to wonder: "How could this be?", I am the administrator of the machine, I am the system admin of the SQL Server, so there is no way I can't access the report server. Well, you are right, except for one minor detail...
The default setup account that has access to the report server is only BUILTIN\Administrator, so everyone else cannot access the page. You can do one of the following:
So a few minutes later I am off making reports and deploying them to the site which I now have access.