Hello, I have a bizarre problem that I hope you can help with. I have two Windows Server 2008R2 servers linked over a VPN. Both are domain controllers, and are configured as two different sites in Active Directory. They are both using themselves as the DNS server and the other as the secondary dns server. DNS, Active Directory, and DFS replication seems to be working between the sites, at first.
My problem is that it seems that all name resolution between the servers for anything useful goes away after a period of a couple hours. I can still ping the servers from each other by name and nslookup returns proper results when this happens, but nothing else seems to work as expected between the sites. When i try to connect by name, I get an RPC error when I try to browse the remote file shares on either server, I cannot connect via RDP, and i get an access denied error when i try to remotely manage a remote computer with the administrative tools.
If i try to connect to the file shares or RDP using the IP address, it works fine. It also works fine if a client computer tries to access via name. The DNS entries for both servers appear fine, and I have even added entries to the HOSTS file with no improvement. I have also tried using the other server for DNS but that did not help either.
When I restart the server at one site, all is well again and appears to work fine for a while. I can access everything just fine as expected at this point, file browsing, RDP, and replication works, but then it breaks again after a few hours. The connection at one site uses a flakey DSL line that has intermittent issues throughout the day. We are getting a fiber line installed next month, but have to suffer with the DSL until then. I am not sure if that would cause this behavior. It definitely seems like a name resolution issue, but this happens even with static HOSTS file entries. NETBIOS over TCPIP is disabled as well.
Please let me know if you have any thoughts on this issue. Thank you in advance for your assistance.