Connection Filter agent: DNS is not configured. IP Allow List and Block List providers will be skipped.

This Error event indicates that no Domain Name System (DNS) servers are configured in the advanced properties of the TCP/IP configuration of the network adapter on the server. IP Allow list and IP Block list and IP Block list providers and Safelist functionality will not function until this error is resolved.

To resolve this error, follow one or more of these steps:

• Review the System log and Application log for related events. For example, events that occur immediately before and after this event may provide more information about the root cause of this error.

• Open a command prompt and run ipconfig /all, and then make sure that there are no DNS servers listed in properties of the network adapter. If there are no DNS servers listed in the network adapter properties, follow one of these steps:

  • If the server uses DHCP to obtain an IP address and a DNS server, contact the DHCP administrator and have them correct the DHCP configuration.

  • If the server uses a statically assigned IP address, enter DNS records in the TCP/IP properties of the network adapter and run ipconfig /flushdns and ipconfig /registerdns at a command prompt.

• If the previous steps do not resolve the problem, contact Microsoft Customer Support. For information about how to contact support, visit Microsoft Help and Support.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.