链接服务器 - 无法访问用户数据库

Question

我有2个SQL Server 2016实例，都在SP1 CU8级修补。我在它们之间创建了一个链接服务器，其定义如下：

    USE [master]
GO

/****** Object:  LinkedServer [MyServer]    Script Date: 4/27/2018 12:58:24 PM ******/
EXEC master.dbo.sp_addlinkedserver @server = N'MyServer', @srvproduct=N'', @provider=N'SQLNCLI'
 /* For security reasons the linked server remote logins password is changed with ######## */
EXEC master.dbo.sp_addlinkedsrvlogin @rmtsrvname=N'MyServer',@useself=N'False',@locallogin=NULL,@rmtuser=N'SA',@rmtpassword='########'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'collation compatible', @optvalue=N'false'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'data access', @optvalue=N'true'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'dist', @optvalue=N'false'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'pub', @optvalue=N'false'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'rpc', @optvalue=N'false'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'rpc out', @optvalue=N'false'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'sub', @optvalue=N'false'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'connect timeout', @optvalue=N'0'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'collation name', @optvalue=null
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'lazy schema validation', @optvalue=N'false'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'query timeout', @optvalue=N'0'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'use remote collation', @optvalue=N'true'
GO
EXEC master.dbo.sp_serveroption @server=N'MyServer', @optname=N'remote proc transaction promotion', @optvalue=N'true'
GO

创建链接服务器后，如果我查询系统数据库中的表，它可以正常工作。但是，无法看到用户数据库。 sa帐户当然是目标服务器上sysadmin的成员。我还尝试在目标数据库中创建一个显式用户。

我还尝试将用户数据库设为默认数据库。