> Maybe the 1.4.1 JVM has an issue recovering once it thinks a host is down.

I don't mean to be cute, but are you sure that you are running on JVM 1.4.1
on that system?  The defect you are describing is in the release notes for
JVM 1.4.1: "Prior to J2SE 1.4 if InetAddress.getByName if a lookup to the
name service failed then all subsequent lookups of that hostname would fail
for the lifetime of the virtual machine."

More details at http://java.sun.com/j2se/1.4.1/networking-relnotes.html.
See also the javadocs:
http://java.sun.com/j2se/1.4.1/docs/api/java/net/InetAddress.html (section
on InetAddress Caching) and
http://java.sun.com/j2se/1.4/jcp/j2se-1_4-mr_docs-spec/net.html (the bottom
of the page).  You could also try 1.4.2, although I don't see anything in
the release notes
(http://java.sun.com/j2se/1.4.2/docs/guide/net/relnotes.html) that suggests
a later fix.

You could try setting networkaddress.cache.negative.ttl to 0, and see if
that helps in your situation.

        --- Noel


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