Windows can't communicate with the device or resource (primary DNS server)

Question

I use Windows 7 Home premium. I connect to the Internet through Homeplug. When i connect and enable the LAN the status shows i'm connected ( the IPv4 shows connected). But after like 20 seconds it changes to No Internet connection. In the meantime i can't even connect to the internet. My browser (firefox) shows server not found. When i run the troubleshooter it says "Windows can't communicate with the device or resource (primary DNS server)". Please Help.

Answer 1

The reset command is available in the IP context of the NetShell utility. Follow these steps to use the reset command to reset TCP/IP manually:

To open a command prompt, click Start and then click Run. Copy and paste (or type) the following command in the Open box and then press ENTER:
cmd
At the command prompt, copy and paste (or type) the following command and then press ENTER:
netsh int ip reset c:\resetlog.txt
Note If you do not want to specify a directory path for the log file, use the following command:
netsh int ip reset resetlog.txt
Reboot the computer.

I tried this on my computer and it seems to work ok for me