Net filtering puzzle

[Dennis Kaarsemaker]

I have a net filtering puzzle for the interested

Setup:

Freshly installed Ubuntu Hoary + apache2 + mod_ssl

What works:
* connecting to http port 80
* connecting to https if running on any port higher than 1023

What does not work:
* connecting to https on 443 or any port below 1023
* Even nmap shows these ports as filtered

My network admin tells me that there is no filter on the router (not
NAT) that this server is connected to, and I did not install any
iptables rules too.

So are there any other sources than iptables (iptables -L is empty) that
could cause this or is my network admin confused?
-- 
Dennis K.
  - Linux for human beings: http://www.ubuntulinux.org
  - Linux voor normale mensen: http://www.ubuntulinux.nl
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