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IBM Sametime & SQL Server
Port 1533 is primarily known for IBM Sametime, which is an enterprise instant messaging and collaboration platform, as well as some communication with Microsoft SQL Server components. It facilitates virtual meetings, rich media chat, and integration with various enterprise tools that support real-time messaging and presence information..
Port 1533 is officially assigned by IANA for IBM Sametime (formerly known as Virtual Places), an enterprise messaging suite that provides instant messaging, presence awareness, and meeting capabilities. IBM Sametime uses this port to establish chat sessions and facilitate real-time communication between clients and the Sametime server infrastructure.
This port is utilized primarily over TCP for session initialization and message exchange. Within an enterprise environment, multiple components of Sametime — including messaging, conferencing, and presence services — rely on traffic over port 1533 for initial login, authentication negotiation, and ongoing chat streams. The port may also be used indirectly during integrations with other collaborative or directory services.
Aside from Sametime, port 1533 can also be associated with Microsoft SQL Server when used in custom configurations or by specific connectors. However, this is less common and typically specific to hybrid deployments where chat services interact with database components.