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I don't think Jenkins caches DNS entries. The JVM does. Try running your container (Winstone or whatever you use) with this JVM flag -Dsun.net.inetaddr.ttl=0
See - this javadoc for more details - http://docs.oracle.com/javase/7/docs/api/java/net/InetAddress.html namely
Two Java security properties control the TTL values used for positive and negative host name resolution caching:
networkaddress.cache.ttl
Indicates the caching policy for successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the successful lookup. The default setting is to cache for an implementation specific period of time.
A value of -1 indicates "cache forever".