Nslookup is a command-line tool used specifically to test DNS resolution. Using nslookup, a query can be sent to a specific DNS server, or the list of DNS servers in the IP settings can be used. Nslookup can also be used to query several different types of records.
4.4.0 Primary target IP address responded with: "421 4.2.1 Unable to connect." Attempted faillover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts.
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