Before restarting the AdminServer, in order to rule out an issue with a java Ipv6 not releasing ports properly so it ends up with being owned by kernel:
Edit DLC/properties/AdminServerPlugins.properties under the [PluginPolicy.Progress.AdminServer] section and add the following to the end of the current jvmargs line:
-Djava.net.preferIPv4Stack=true -Djava.net.preferIPv6Addresses=false