Windows Live Messenger
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TCP — Messaging
Port Overview
What is Port 1503?
Port 1503 was used by Microsoft NetMeeting and Windows Live Messenger (MSN Messenger) for data conferencing and file transfer. It supported whiteboard sharing, application sharing, and file transfer in Microsoft's conferencing products. The service was discontinued in 2013 when Microsoft migrated users to Skype.
Security Considerations
Port 1503 (Windows Live Messenger) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.
Recommendation: Standard security practices apply. Keep software updated and monitor access.