We do have a Win Server 2003 R2 with DNS , DHCP and Active Directory . For some strange reason our Win 7 stations and server sometimes drop the internet connection ( not the network connectivity). To be sure was not a ISP related issue I left one computer all day connected directly to the ISP router . The PC didn't had any issue. To test the internet connection I use a free software that basically connects to one site in this case Google or Yahoo as you may see on the attached file.
I left the software running all day and the internet drop is completely random . Sometimes it works for hours then it stops for 2 , 5 , 20 minutes then it goes back in. To verify that again was Not a ISP related issue I left the same computer connected to the router where the router was the one giving the IP and not the DHCP on the Win server. When the server drops the Internet connection the PC was working perfectly.
I like to mention... when the server says Not Connected I try to ping via CMD www.yahoo.com
or any site and the ping didn't respond. However if i ping using the website or server IP instead of the Name the ping respond without any issues. This makes me wondering that is something related to the DNS role.
As soon the internet is back and working I open the CMD and ping the same website or server example www.yahoo.com
and it reply without any issues.
Any advice or tips will be appreciated!