If enabled then new iSNS servers may not be added and thus new targets discovered via those iSNS servers; existing iSNS servers ...

If enabled then new iSNS servers may not be added and thus new targets discovered via those iSNS servers; existing iSNS servers may not be removed. If disabled then new iSNS servers may be added and thus new targets discovered via those iSNS servers; existing iSNS servers may be removed.