select sp.name, spe.permission_name 
from sys.server_principals sp inner join 
sys.server_permissions spe
on sp.principal_id = spe.grantee_principal_id
where spe.grantee_principal_id > 4 and sp.type <> 'R' 
and spe.class_desc = 'endpoint'

Name                       Permission_name
MyDomain\hanode2-sql       CONNECT

Name                       Permission_name
MyDomain\hanode1-sql	   CONNECT

select SUSER_NAME(principal_id), name
from sys.database_mirroring_endpoints