You can check the network connection status in the following way.
Checking the Network Status Using Network Light
Printing a Network Connection Report
Messages and Solutions on the Network Connection Report
E-1
E-2, E-3, E-7
E-5
E-6
E-8
E-9
E-10
E-11
E-12
E-13
Message on the Network Environment
Printing a Network Status Sheet
Checking the Network of the Computer (Windows only)