Steven Siloti
8a33aa199d
The SERVFAIL RCODE can be generated for many reasons which may not be related to lack of feature support. For example, the Stubby resolver generates SERVFAIL when a request times out. Such transient failures can cause unnecessary downgrades to both the transaction and the server's feature level. The consequences of this are especially severe if the server is in DNSSEC strict mode. In this case repeated downgrades eventually cause the server to stop resolving entirely with the error "incompatible-server". To avoid unnecessary downgrades the request should be retried once with the current level before the transaction's feature level is downgraded.
System and Service Manager
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