The customer mentioned that the replication from the Child SMP to the Parent SMP stopped working few days ago.
The NS log showed that it is trying to reach "could not connect to the local server http://CHILD01.na.domain
The Child and Parent SMP should be using HTTPS links to connect and not HTTP.
Under the SMP Console>Settings>Notification Server >Hierarchy>Topology tab, it showed that the proper HTTPS link reference is right.
The NS logs on the Child SMP showed the following entry while trying to replicate up:
Unable to schedule replication to the specified server (Server: PARENT01.EA.DOMAIN.NET, Exception: Altiris.NS.Exceptions.AeXExcep
Date: 4/17/2018 1:15:01 PM, Tick Count: 1035826687 (11.23:43:46.6870000), Size: 1.31 KB
Process: AeXSvc (1336), Thread ID: 79, Module: Altiris.NS.Replication.Hierarc
Priority: 1, Source: HierarchyRuleManager.ResolveRu
ITMS 8.1 RU6
set state = replace (cast (state as nvarchar (max)), 'http://CHILD01.na.domain.net/Altiris/','https://ACHILD01.na.domain.net/Altiris/
where guid = 'F241DB2F-F30D-4C19-AC4E-A15DA