A floating license managed by a server.
Most Gerber dongles have a solid red or green light. If it’s blinking or dark, the hardware might be failing or the port is dead. Try a different USB port (preferably on the back of the PC if using a desktop). 2. Restart the Sentinel LDK License Manager
AccuMark relies on a background service to "see" the license. If this service crashes, the software won't open. Press Windows Key + R , type , and hit Enter. Scroll down to find Sentinel LDK License Manager . Right-click it and select Restart . a valid accumark license was not found for this product
If none of the above steps work, the issue may be internal to the license itself:
A physical USB device (often purple or green) plugged into your computer. A floating license managed by a server
You can verify if the computer sees the license through a web browser: Open your browser and type: http://localhost:1947 Click on in the left sidebar.
Install it, restart your computer, and try launching AccuMark again. 5. Check Network and Firewall Settings If your office uses a : Try a different USB port (preferably on the
Check that your Firewall isn't blocking port (the port used for license communication).
The error usually triggers because the service has stopped, the dongle is unrecognized, or the license has expired. Step-by-Step Troubleshooting 1. Check the Physical Connection If you use a USB dongle: