@joaomanoelc Hi,
Thank you for posting in Q&A!
According to my research, event ID 5504 is logged when a DNS Server receives a packet containing an invalid domain name. There are many possible causes.
- The DNS cache becomes corrupt with invalid domain names.
- The DNS Server receives a spoofed response.
- The DNS response contains domain names with characters other than 0-9, a-z, A-Z, . (Period), and - (Hyphen).
- The DNS Server has been configured with invalid forwarders
- The network the DNS server resides on is busy or not working properly.
I find that 192.33.4.12 is a name server which has the name "c.root-servers.net". Since you mentioned "I don't use forwarding" Do you configure 192.33.4.12 as your DNS server directly?
Hope you have a nice day!
Gloria
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