MSNP

MSNP, or Microsoft Notification Protocol, is primarily used by Microsoft services such as MSN Messenger. It facilitates real-time communication and notifications between users. The protocol operates over port 1863 and is essential for the functionality of these messaging services.

What is MSNP

MSNP, or Microsoft Notification Protocol, is a protocol developed by Microsoft to support real-time communication and notifications. It is most famously associated with MSN Messenger, a popular instant messaging service that allowed users to chat, share files, and send notifications in real-time. The protocol operates over port 1863, which is designated for this specific purpose.

MSN Messenger, later rebranded as Windows Live Messenger, was a cornerstone of online communication in the early 2000s. The service utilized MSNP to manage the exchange of messages, presence information, and other notifications between users. This protocol ensured that messages were delivered promptly and that users were notified of new messages or changes in their contacts' status.

While MSN Messenger has since been discontinued, the underlying principles of MSNP continue to influence modern communication protocols. The protocol's design emphasizes low latency and efficient message delivery, which are critical for any real-time communication service. Understanding MSNP provides valuable insights into the evolution of instant messaging technologies and the ongoing importance of efficient notification systems.

MSNP runs on TCP and UDP port 1863 and is official IANA port.

Security risk

If port 1863 is open and the MSNP service is running, it could be exploited by attackers to intercept or manipulate real-time communications. This could lead to unauthorized access to sensitive information, such as personal messages or contact details. Ensuring that this port is secured and monitored is crucial to maintaining the integrity and confidentiality of the communication service.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 1863. Use StackChanges to monitor if the MSNP port is closed and stays closed. StackChanges will send an alert if port 1863 is open again.