The most common source of Dell Printer Offline problem is a breakdown in communication between the PC, wireless router, and printer via the WIFI connection. This results in a change of the IP address. There are three possible causes for this problem or a combination of them:

· To save energy, the computer is turning off the wireless adaptor.

· The communication error is caused by a firewall or antivirus software.

· The printer settings are missing network information, or the IP address is incorrect.