Connect with RDP or Console to Parent and Child site servers.
Install Trace32.exe from SMS2003 toolkit (Installation is easy, copy it into %Windir% and start it). With Trace32 you can look at the log’s without locking them and they also update on the screen when there are changes in them. Excellent tool which you must have as SCCM specialist.
Open all below log files and put them up so you see them all on both child and parent RDP window.
Parent: Sender.log, Replmgr.log, Objreplmgr.log
Child: Despool.log, Replmgr.log, Objreplmgr.log, Distmgr.log
In console, update the distribution point that is not updating, look for errors in the logs..
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