Access server of a friend denied

hello everyone, I have a problem when I want to connect to the server of a friend who is not online, I cannot launch his server even though I have full permissions.

There is an error message that says "Access Denied.

You do not have permission to view this page. Ask * nameofmyfriend * to allow you to access this page. "

How to fix this ?

Thank you

Okay he just told me that permissions are unchecked each time despite the backups any ideas how to fix ?

yes but it's always unchecked when he exit and come back

It's finally working ! I don't know how but it's working !