The system you need to reach lost its link to the network. If the ping command returns an increasing number of packets sent, you are connected to the system you need. Press Ctrl-C to interrupt the ping. If the ping command returns 0 packets sent , you are not connected to the system you need. The problem may be with your system, the target system, or the network itself.
Some commands work only when a specified device is up.
For example, you cannot print to a printer that is turned off. You may receive an error message if your command requests an unavailable device. The output file is locked because someone else is already using it. Wait a few minutes and try again. The output file does not exist in that directory.