Many thanks to *many* people for concice and prompt replies to my problem.
I'm enclosing one reply for a summary, everyone said pretty much the same
thing. Thanks again!
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It appears that there are problems with the setup of the
"174.134.in-addr.arpa" domain. The "in-addr.arpa" domain is used
to answer questions of the form: Given the IP address W.X.Y.Z,
what is the hostname corresponding to the given address?
"gethostbyaddr(3)" uses this sort of lookup.
Apparently there are no entries in the "174.134.in-addr.arpa" domain
for your IP addresses, IP: 220.127.116.11 and IP: 18.104.22.168. There
should be a couple PTR type records:
22.214.171.124.in-addr.arpa IN PTR sparcy.dfci.harvard.edu.
126.96.36.199.in-addr.arpa IN PTR tempdemo.dfci.harvard.edu.
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This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:06:11 CDT