Dns May Fail To Resolve Top Level Domain

When the problem is occurring, an NSLOOKUP command issued for an affected name will return the error “server failed”. A network trace will show that the DNS server does not send any traffic for such a request to the Internet. Furthermore, No events related to a problem are reported in the DNS Event Log. Interestingly, the DNS server does not exhibit this behavior if DNS Server is configured to use forwarders for Internet name resolution instead of root hints. To resolve the issue you can configure your DNS servers to forward to your ISP’s DNS servers. When 2008 DNS servers are configured as forwarders, this issue is not exhibited. To resolve the issue and continue using root hints, change the MaxCacheTTL registry value to 2 days or greater. Modify the registry at your own risk. Set the MaxCacheTTL to 0x0 if you do not want the DNS server to cache any recursive queries.