I have a Server 2003 Small Business Server that loses Internet connectivity every hour on the hour, for about 15-20 minutes. I can't figure out what's causing it. The machine still has LAN connectivity, but it loses its Internet connection, and people who are trying to connect remotely (via RRAS) can't get in. Then, after about 15 min., it works again. I checked to see if any services are scheduled to run and are knocking it offline, but there doesn't seem to be anything. Checked Event Viewer and it looks normal. Any ideas as to what this might be? Thanks…
Server loses Internet connectivity every hour on the hour
networkingrraswindows-server-2003windows-server-2008
Best Answer
Regular intervals smells of DHCP problems. You're getting your IP from an external device, right? I'm no familiar with AT&T policies (different continent..) but sounds like your public IP address somewhat goes 'down'. I think the problem might not even be on your side..
[updated] 2 dhcp servers DO fight if they are on the same subnet. It works this way: at regular intervals your server sends out a message saying "hi, can I keep my IP?" and both servers answer. Apparently, after some struggle, your server gains its ip back.
Solution:
or
or
Your mileage may vary but please do not put two dhcp on the same subnet! :)