A significant number of DNS queries have been requested for %1, but this query does not resolve. This has occurred %2 times ...

A significant number of DNS queries have been requested for %1, but this query does not resolve. This has occurred %2 times in the last  %3 minutes. There have been %4 errors in total.
Resolution:
 For SRV queries, this indicates that a significant number of users are interested in communicating with users in the identified domain. The owner of the domain must enable it for federation and your infrastructure must be configured for federation. For DNS A queries, this indicates that a specific server's IP address cannot be found in the DNS. If this is a server in one of your administered domains then please correct this issue.