Event ID - 1

Event Id1
DescriptionYou are running a version of Microsoft SQL Server 2000 or Microsoft SQL Server 2000 Desktop Engine (also called MSDE) that has known security vulnerabilities when used in conjunction with the Microsoft Windows Server 2003 family. To reduce your computers vulnerability to certain virus attacks, the TCP/IP and UDP network ports of Microsoft SQL Server 2000, MSDE, or both have been disabled. To enable these ports, you must install a patch, or the most recent service pack for Microsoft SQL Server 2000 or MSDE from http://www.microsoft.com/sql/downloads/default.asp.
Event InformationAccording to Microsoft :
Because the Windows Server 2003 family does not support SQL Server 2000 SP2 or earlier versions of SQL Server 2000, Windows Server 2003 blocks both the TCP/IP network ports and the UDP network ports that are required to connect to an instance of SQL Server 2000. Therefore, you cannot connect to an instance of SQL Server from a remote computer on your network by using the TCP/IP protocol.
To resolve this problem, upgrade all the instances of SQL Server 2000 that are running on a Windows Server 2003-based computer to SQL Server 2000 Service Pack 3 (SP3) or to a later version of SQL Server 2000.
Reference LinksYou may not be able to connect to an instance of SQL Server 2000 Service Pack 2 or earlier that is installed on a Windows Server 2003 computer through the TCP/IP port

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