It means that your TCP/IP configuration is incorrect.
What happened to your system shortly before the problem started?
If you have scanned your system with a quality anti-malware application and confirmed that you are malware free, do the following; otherwise, download and run Malwarebytes (https://www.malwarebytes.com/). If you decide not to buy it, after the 14-day trial, it will convert to an on-demand only scanner (or, of course, you can uninstall it).
- Click Start, type ncpa.cpl in the Search box, and press Enter.
- Right-click on whichever network adapter you're using (either Local Area Connection or Wireless Network connection) and select Properties
- Other than the line for "Eset Personal Firewall," how is your adapter's properties list different from that shown below?
Assuming that you have at least Client for Microsoft Networks, File and Printer Sharing for Microsoft Networks, and Internet Protocol Version 4 (TCP/IPv4) checked, do the following:
- Open an Elevated Command Prompt (click Start, type Command Prompt in the Search box, right-click on the line, and select "Run as administrator"; respond as needed to the UAC prompt).
- Type the following commands in the Command Prompt window and press Enter after each line
netsh winsock reset
netsh int ip reset
ipconfig /flushdns
If those commands didn't help, sometimes uninstalling the network adapter and rebooting (which will automatically reinstall the adapter) helps. To uninstall, go to Device Manager, right-click on the adapter, and select "Uninstall."