: If the dongle has an LED, check if it is lit or flashing. A flashing red light often indicates a driver or connection problem. Driver & Software Solutions Resolving Security Device (USB) Issues (Dongle)
drivers. If you recently updated your OS, the old driver might be blocked. You can often download the latest Sentinel LDK Run-time to fix communication issues. Check Windows Services services.msc , and hit Enter. Sentinel LDK License Manager HASP Loader : If the dongle has an LED, check if it is lit or flashing
