The remote host is missing updates announced in advisory CLSA-2006:1058.
This announcement fixes a denial of service vulnerability in racoon that could be exploited when running in aggressive mode via specially crafted IKE packets, which triggers a null dereference and cause an application crash, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1.
Solution: The apt tool can be used to perform RPM package upgrades by running 'apt-get update' followed by 'apt-get upgrade'