We switched internet service providers and I had to change all public IP addresses. I can access the internet while I'm in the office. We house our own external DNS Servers and I change the IP's within DNS. I can't find our Domain, access OWA, our VPN server or anything from the outside...It has been 10 hours and when I ping the anything of ours from the outside it still shows the old IP address. I don't know what to do now. it's a windows dns server.