Azure vm configures dns forward, a large number of 5504 events occur, what is the reason?

Question

This address (168.63.129.16) is configured in the DNS forwarder on Azure vm， a large number of 5504 events。

event：

The DNS server encountered an invalid domain name in a packet from 168.63.129.16. The packet will be rejected. The event data contains the DNS packet.

Answer 1

Hi,

Could you please explain your setup little bit like :

1. What is the Operating System of your VM ?
2. whether your VM is domain joined or standalone VM?
3. Where you have configured this forwarder ?
4. is that port no 53 is allowed between your VM and DNS server ?
5. What kind of DNS server you are using MS DNS or some DNS appliance ?

Also I could see another blog post where same type of issue was discussed. So mentioning the link below. You can check those answers as well.

https://social.technet.microsoft.com/Forums/windowsserver/en-US/1ed06e4a-ca31-4594-b8b5-5a9e40811534/forum-faq-how-to-troubleshoot-dns-event-5504-error?forum=winserverNIS

Thanks & Regards,
Pritam Ghatak (Prips)

 

Please take a moment to "Mark as Answer" and/or "Vote as Helpful" wherever applicable. Thanks!