https://github.com/openshift/ose/pull/880
Tested on ocp build v3.6.173.0.49 The conntrack entry about the udp connection will be deleted immediately once the service endpoint gets deleted.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2017:3049