Please make sure that the device and the login computer are on the same LAN; there is no IP conflict between the other devices and the device, and the IP conflict will cause login failure. The method of judgment is as follows: first disconnect the device, then ping the device IP on the computer to ping the instructions. If ping works, then this LAN IP is already in use.
Check and make sure that the network port indicator is on. If the indicator is off, the network is unreachable, causing the login to fail. In this case, check the network.