If the cable connections are secure and no problem is found in the network, make sure that the IP address and other such settings are appropriate. The settings on both the machine and the computer must be appropriate. Redo the settings, checking to ensure that the machine's IP address set during the driver's installation process does not conflict with the IP address for another device on the network, that the machine's IP address is specified on the computer, that the output port and device are correctly specified and the settings are correct, and for other problems.
