DNSE-221 — Connection to server failed
Proxy tried to connect selected server, but this operation failed. The reason can be either a system error (C-level message), a network error (E-level message), or a temporary unavailability (D-level message). Detail description of the error can be found in preceding KERN-100 message.
Proxy reaction depends on the reason. Request either will fail (C-level), will be retried to another server (E-level), or will wait to connect() completion (D-level).