The DNS server will send requests to other DNS servers on a port other than its default port (TCP port 53). This is done to accommodate configuration changes you have made at the DNS server and prevent it from failing to receive DNS queries it makes to other servers. You might want to change this behavior. For more information, see “DNS server log reference” in the online Help. This DNS server is multi-homed (running on multiple IP addresses), but has been configured NOT to run on ALL IP addresses available on the machine. Under these conditions it is impossible to guarantee that a DNS query to a remote DNS server will be sent with one the IP addresses the DNS server is using, and hence, whether the response to that IP address, will be received on the DNS port. To avoid this problem, sends to other DNS servers will be done on a arbitrary (non-DNS) port, and the response will be received regardless of the IP address used. If you wish to use the DNS port for sends to other DNS servers, then you must change your configuration to either: 1) use all IP addresses on the machine for DNS (i.e. eliminate the listen address list) or 2) limit the DNS server to use a single IP address.

Details
Product: Windows Operating System
Event ID: 413
Source: DNS
Version: 5.0
Symbolic Name: DNS_EVENT_NON_DNS_PORT
Message: The DNS server will send requests to other DNS servers on a port other than its default port (TCP port 53). This is done to accommodate configuration changes you have made at the DNS server and prevent it from failing to receive DNS queries it makes to other servers. You might want to change this behavior. For more information, see “DNS server log reference” in the online Help. This DNS server is multi-homed (running on multiple IP addresses), but has been configured NOT to run on ALL IP addresses available on the machine. Under these conditions it is impossible to guarantee that a DNS query to a remote DNS server will be sent with one the IP addresses the DNS server is using, and hence, whether the response to that IP address, will be received on the DNS port. To avoid this problem, sends to other DNS servers will be done on a arbitrary (non-DNS) port, and the response will be received regardless of the IP address used. If you wish to use the DNS port for sends to other DNS servers, then you must change your configuration to either: 1) use all IP addresses on the machine for DNS (i.e. eliminate the listen address list) or 2) limit the DNS server to use a single IP address.
   
User Action

To verify and reset the IP addresses on which the DNS server should listen:

1. In DNS Manager, right-click the DNS server in the server list.
2. Click Properties.
3. On the Interface tab, use Add and Remove to edit the list of IP addresses. Use Move Up and Move Down to prioritize the list of IP addresses.
4. When you are finished, click OK.

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