Originally Posted by rtspitz
if your iptables script includes logging of dropped firewall packets have a look at /var/log/messages or equivalent on your system and look for dropped packages with port 10000 as destination.
you said you had another machine on the same net (switch?). if so, just disable your firewall for a sec (maybe unplug internet if you're afraid of hackers) and try again.
Thanks! Disabling firewall and examing logs allowed me to get right in via Webmin and helped me to get a handle on it... it was very obvious the way that webmin displayed the firewall table what the issue was...
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
as the entry preceding my exception for port 10000. By re-ordering my entry before this entry, I am able to get in with the firewall on.
Not that I have any idea what this entry is... but I understand now that order mattters to the firewall.
Guess I'll read up on that at some point... or may disable autostart of the firewall for the time being.