Error message: Protection Key Sentinel HL Max cannot be found. Please check the availabilityof the dongle in your browser at http://localhost:1947

Attach the dongle to one of the PCs in your network, start this PC, and make sure that port 1947 is released on all machines. Please also refer to section 1.2 of the thaTEC:OS user manual or contact us under contact@thatec-innovation.com if the error persists.