Cannot access staging server

Dear community and developers and programmers and nerds,

I am running a custom server with a nginx webserver managed by forge.

On this Server I have two sites.

Staging.offline.vision

and

Offline.vision

when I access Offline.vision => easy no problem

when I access staging.offline.vision => 403 Forbidden You don't have permission to access this resource

I followed this series exactly

https://laracasts.com/series/build-and-configure-a-staging-server

the result you can visit the domain

http://staging.offline.vision/