Saturday, July 17, 2004 01:30 PM
I think that means that on the machine where it occurred, the resolver could not find an IP address or MX record, for that hostname.
So something either is funny with the DNS server used by that machine inside that firewall, or the machine uses a hosts file which is screwed up. Or maybe it was a temporary problem?
I think, usually behind a firewall, the DNS will resolve hostnames like that, but you'll get an error like connection timed out, host unreachable etc., not an unknown host.