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Prior to SQL Server 2000, only one instance of SQL Server could be installed on a computer. SQL Server listened for incoming requests on port 1433, assigned to SQL Server by the official Internet Assigned Numbers Authority (IANA). Only one instance of SQL Server can use a port, so when SQL Server 2000 introduced support for multiple instances of SQL Server, SQL Server Resolution Protocol (SSRP) was developed to listen on UDP port 1434. This listener service responded to client requests with the names of the installed instances, and the ports or named pipes used by the instance. To resolve limitations of the SSRP system, SQL Server 2005 introduced the SQL Server Browser service as a replacement for SSRP.
Side-by-Side Installation with SQL Server 2000
In SQL Server 2000, the identification of the server connection endpoints is performed by the SQL Server service. SQL Server 2005 replaces that function with the SQL Server Browser service. If you install SQL Server on a computer that is also running SQL Server 2000 or MSDE, you must make sure that SQL Server 2000 or MSDE is upgraded to Service Pack 3a (SP3a) or later. Versions earlier than SP3a do not properly share port 1434 and may not make your instances of SQL Server available to requesting client applications. Although you can change the services startup order so that the SQL Server Browser service starts before SQL Server 2000 or MSDE, we recommend that you update all earlier versions of SQL Server to the latest service pack.
When an instance of SQL Server 2000 that is not updated to at least service pack 3a is installed on the computer, if the SQL Server Browser is not running, the SQL Server 2000 listener service starts. If SQL Server Browser starts after the listener service, it waits 5 seconds for SQL Server 2000 to give up port 1434. If that does not occur, SQL Server Browser fails to start. To resolve this problem with versions of SQL Server 2000 earlier than Service Pack 3a, stop SQL Server 2000, start SQL Server Browser, then restart SQL Server 2000. The SQL Server 2000 listener service continues to attempt to start on port 1434; therefore, the instance of SQL Server 2000 should be upgraded to Service Pack 3a as soon as possible.
SQL Server 7.0 has no similar capabilities and has no conflicts with SQL Server Browser.
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