A brief summary: I’m working with Spacewalk for three years now, from version 2.4 on. We manage about 350 systems, 30+ channels, 50+ repositories and 105.000+ packages. We import new packages and errata on a daily basis, roll out critical patches to stage systems automatically and do weekly/monthly patchdays on productive systems exclusively via Spacewalk. Lately the periodic syncs of our CentOS 6 x86_64 channel failed on every run. New packages stayed in the queue and could not be rolled out to our systems.