Lexmark MS431
From the control panel, navigate to:
Settings > > Reports > > Network > > Network Setup Page >
Check the first section of the page and confirm that the status is connected.
If the status is not connected, then the LAN drop may be inactive, or the network cable may be unplugged or malfunctioning. Contact your administrator for assistance.
Checking the printer firmware to latest version.
This article serves as a guide to gathering necessary information before opening an escalation item for network connectivity issues.