This is interesting; whilst I wouldn't expose ILO to the public internet, it should work nonetheless... in addition to the IPS and Packetfilter logs, check the IM/P2P logs as well (if you have those features enabled)... sometimes the IM/P2P filter falsely detects traffic and blocks it. Failing that, I'd probably start a case with Astaro.

__________________
Convergent Information Security Solutions, LLC
Astaro Preferred Solution Partner