Try PINGing the device from the PC that you are trying to view the webscreen from.

If the PING is not successful, check the physical connection, then confirm that the Ethernet parameters are set correctly on the HMC screen. You can do this by holding the lower left corner of the
screen while the device is powering on.

If the Ethernet parameters are not correct, then you can
download the correct Ethernet parameters from MAPware 7000 over USB. To set the
correct parameters, go to Project > Properties > Ethernet. Click OK and
open the download manager. Select “Ethernet Settings” and download.