Cannot Find The Certificate Object When Creating Endpoint

Hi,

I try to implement mirroring using certificate authentication.
When I do this query :


create certificate Principal_cert with subject = 'Principal certificate', start_date = '2007/11/01', expiry_date = '2020/11/01';
GO

Create endpoint endpoint_Princ state = started

as tcp(listener_port = 7024, listener_ip = all)

for database_mirroring (authentication=certificate Principal_cert, encryption = disabled, role = all);

GO


I have this error :


Msg 1088, Level 15, State 1, Line 1

Cannot find the object "Principal_cert" because it does not exist or you do not have permissions.


I have also noticed that the error does not occured when I try this in the master database.

So, I have two questions:

1. Why SQL server does not find a certificate that just been created ?
2. Should the certificate be in the master database or in the database being mirrored ?

Thanks for any help.