You can check the network connection status in the following way.
Checking the Network Connection Status from the Control Panel
Checking the Network Connection Status using the Network Icon
Displaying Detailed Network Information on the Control Panel
Printing a Network Connection Report
Messages and Solutions on the Network Connection Report
E-1
E-2, E-3, E-7
More
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)