Hi ronnie_dk -
If you have manually pinged your ISP's DNS server, then the issue is that ping in Linux defaults to continuous pings until you stop it. Not like Windows where ping is configured to stop after four requests.
If you do a "ping -c 3" , you'll stop after 3 tries.
BTW, you typically don't need to use or know your ISP's DNS server IP address if you have SME set up in Server-and-gateway mode. SME has a built-in cacheing DNS server that works fine.
RonM