We recently upgraded our Domain from 2003 to 2008 R2. We are also running DNS (AD Integrated). The old Domain Controllers have been retired, roles moved to the new AD controllers, and DNS entries for them have been removed. DHCP scope has been updated with the new DNS servers.
Since we have made the change, we have an issue where the same URL (for our internal Helpdesk Site) will stop responding. This impacts IT only, as we are the only ones that access the site. The other thing that seems to be similar is the clients accessing/having issues are running Windows 7 x64. My colleague is still running Windows XP - and never has the issue.
What will happen is we will go to the URL - it will work most of the day for me, but through out the day (maybe once or twice) I will get Page cannot be displayed. When that occurs the following is also true:
1) I cannot ping the URL (get unknown host).
2) If I do an nslookup however -> the DNS server provides the correct IP to FQDN
I always end up having to ipconfig /flushdns and then ipconfig /registerdns. At this point I am not sure if it is client related, or DNS related. The reason I am posting here, is because of the recent changes in our infrastructure.
Should also advise - I am on the same network/location as the DNS servers. There is no firewall between us. It is always the same URL that has issues. (There is a second one that also has problems). All other URLs/FQDN's are working fine. We have no issues with forwarders - internet resolution is working from all locations.