: A working dongle should have a steady red light. If the light is off, try a different USB port or another computer to rule out hardware damage.
Outdated or corrupted drivers are a primary cause of plug failures, especially after Windows updates. hasp plug failure optitex 15 solution
: Plug the dongle directly into the computer's motherboard ports rather than external hubs. 2. Verify the Sentinel LDK License Manager Service : A working dongle should have a steady red light