Below are the proven fixes, arranged from simplest to most technical.

For corporate users whose licenses are hosted on a DSLS server:

If you cannot connect to the server, contact your IT department to ensure the DSLS service is running on the server.

You cannot simply ignore this message. CATIA will either close immediately or enter a "grace period" (usually 5–10 minutes) before forcing a shutdown. Here is your prioritized action plan:

CATIA (Computer-Aided Three-dimensional Interactive Application) is the gold standard for product design and engineering used by aerospace, automotive, and industrial machinery giants. It is a complex, high-performance tool—and like all professional software, it relies on a robust licensing system.

Few messages strike more dread into the heart of a CAD engineer than the pop-up window displaying: "The expiration date of your license has arrived."

This notification typically appears in the CATIA License Manager or as a system tray alert. It abruptly halts your workflow, preventing you from saving, editing, or even launching new workbenches. Before you panic, contact your IT department, or assume the software is broken, it is crucial to understand why this happens and how to fix it.

This comprehensive article will dissect the meaning of this error, explore the various types of CATIA licenses that can trigger it, provide step-by-step troubleshooting procedures, and outline long-term prevention strategies.