DNS 8 NXRRSET vs 19 BADMODE
Both DNS 8 (NXRRSET) and 19 (BADMODE) belong to the DNS Response Codes (RCODEs) category. 8 indicates that rR Set that should exist does not. A required resource record set is missing from the zone. Meanwhile, 19 means that bad TKEY Mode. The TKEY mode field contains a value not supported by the server.
Descripción
RR Set that should exist does not. A required resource record set is missing from the zone.
Cuándo lo verás
A DNS UPDATE prerequisite expected a certain RRset to exist (e.g., an MX record), but the zone does not contain it.
Cómo solucionarlo
Create the missing RRset in the zone before retrying the update, or change the prerequisite to not require its existence.
Descripción
Bad TKEY Mode. The TKEY mode field contains a value not supported by the server.
Cuándo lo verás
Your client attempted a TKEY key exchange using a mode (e.g., Diffie-Hellman, GSS-API) that the server does not support or has not been configured for.
Cómo solucionarlo
Check which TKEY modes the server supports and configure your client to use a compatible mode. GSS-TSIG (mode 3) is the most widely deployed.
Diferencias clave
DNS 8: RR Set that should exist does not. A required resource record set is missing from the zone.
DNS 19: Bad TKEY Mode. The TKEY mode field contains a value not supported by the server.
You encounter 8 when a DNS UPDATE prerequisite expected a certain RRset to exist (e.g., an MX record), but the zone does not contain it.
You encounter 19 when your client attempted a TKEY key exchange using a mode (e.g., Diffie-Hellman, GSS-API) that the server does not support or has not been configured for.
Cuándo usar cada uno
For 8 (NXRRSET): Create the missing RRset in the zone before retrying the update, or change the prerequisite to not require its existence. For 19 (BADMODE): Check which TKEY modes the server supports and configure your client to use a compatible mode. GSS-TSIG (mode 3) is the most widely deployed.