Just when I thought I was getting the hang of EPO, I go and screw it up! I reinstalled our organisation's EPO infrastructure from scratch - rolled out some SA distributed repositories and got everything working fine. Stupidly, I then downloaded the 3.5.5 CMA, checked it into the master repository along with the NAP and now none of my repositories are receiving any updates and, when any of my clients try to update, they are failing to connect to the repositories and failing back to HTTP downloads. This caused a massive run on our internet bandwidth, so I have disabled global updating - which seemed to resolve it.
Is there something simple I've missed here, or have I just screwed something up royally? I thought I'd followed all the instructions in the readme file to the letter