About a new SQL Server registration failure issue

server| problem

I entered the database server IP address when the client used SQL Server 2000 "Enterprise Manager"--〉 to create a new SQL Server registry and was told that I did not find the database server I specified.
In the pop-up registration box in the upper right corner of the small button with three dots (that is, enter the server IP address bar to the right button) to select the Local area network database server, but found that the server name did not!
I am also the person who installed n SQL Server 2000 database server, unexpectedly encountered this kind of problem! Depressed for 2 months.
Recently suddenly remembered, SQL Server 2000 Server, did not hit the SQL Server SP3 patch, quickly hit, the problem solved!

It turns out that the SQL Server 2000 service installed on Windows 2003 must have a SQL Server SP3 patch, or you can't even connect to the database at all.
In the past I have installed SQL Server 2000 on Windows Server, no patches can be poisoned, poisoned, it will be remembered to patch, but no matter how to hit the patch, client SQL Server 2000 "Enterprise Manager" to create a new SQL Server registration is very convenient.
Perhaps Microsoft is for system security reasons.
In addition, the client connects to the patch-less SQL Server 2000 Server on Windows 2003 without entering the IP address, and directly entering the server name can actually register the connection and create the database and table. This I always think impassability, this is not the Microsoft has not mended the loophole?