If you can tell me (e.g., V5R21, V5-6R2023, 3DEXPERIENCE) and if you are using a network license or a local (node-locked) license , I can give you more specific, step-by-step instructions. Share public link
Below are the proven fixes, arranged from simplest to most technical. The Expiration Date Of Your License Has Arrived Catia
In some CATIA V5-6R202x versions, a secondary dialog box appears: "License server connection lost. Please contact your system administrator." If you can tell me (e