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MSSQL Monitor
Microsoft SQL Server Monitor port facilitates database discovery and management via the SQL Server Resolution Service. It primarily helps clients locate SQL Server instances and dynamically negotiate ports. This port supports both TCP and UDP, allowing flexibility in network environments. Given its influential role in discovery, it's often a target during reconnaissance, requiring careful management and security controls..
Port 1434 is associated with Microsoft SQL Server's Resolution Service. This service assists SQL client applications by providing details about the SQL Server instances running on a host and their dynamic TCP listening ports. When a client needs to connect, it sends a UDP query to this port, and the server responds with instance information, simplifying connections in dynamic port configurations.
For named instances, SQL Server often uses dynamically allocated TCP ports, making port 1434 vital for resolving which port to connect to. The Resolution Service listens on UDP for incoming connection requests and facilitates routing while managing instance discovery, thus supporting scalability and flexibility within database deployments.
Besides UDP, SQL Server may utilize TCP on this port during initial handshake or server management functions. However, it's predominantly used via UDP for SQL Server Network Interface (SNI) communications. Due to its prominent role in instance resolution, this port often becomes essential in multi-instance SQL server environments.