As far as I understand, the user server is not the user running your web server e.g. www-data, right?
Are you sure about that? I mean, in the sudoers file I added the user server with NOPASSWD and not www-data for the specific service. And it works that way.
Maybe I misunderstand something here, if so please correct me. Is there anyway I could check this out? Do I need to check the owner on my host or my client trying to mount the path?