Port 1387
CADSI-LM License Manager
Port 1387 is mainly utilized by LMS International’s license manager service, historically known as CADSI-LM, to facilitate software license management and distribution within corporate and engineering environments. This port handles communication between licensed engineering software applications and centralized license servers, ensuring legitimate access to specialized CAD tools..
Technical Details
Port 1387 serves an important role in software license management systems, particularly those developed by LMS International (formerly CADSI). It enables communication between client applications running engineering or computer-aided design software and a centralized license server. The protocol implemented here authenticates license usage requests, checks out licenses to clients, and returns licenses upon completion.
This license management communication involves establishing sessions over both TCP and UDP. TCP is often used for reliable, initiated client-server communication such as license checkouts and returns. Meanwhile, UDP may be used for lightweight status or broadcast messages, facilitating efficient updates or license availability queries across a network.
This port is often integrated within enterprise networks hosting high-value engineering software, making it critical to core business workflows. Because license servers act as gatekeepers to expensive proprietary tools, ensuring seamless but secure operation over this port is imperative.