The most common reason for Dell-Printer-Offline problems is a breakdown in communication between the computer, wireless router, and printer via the WIFI connection. This causes a change in the IP address. The following three factors could be the root of this problem. One is the wireless adapter being turned off by the computer to save energy. A firewall or antivirus program may also be to blame for the communication problem. Instead, the printer settings lack network information or the IP address is incorrect.