Here's something to try:
Try connecting to the web admin port from the server itself. Either from the X windows or you probably can use links or lynx from the command line. Use
http://localhost:8080/ServerAdmin as the URL.
If this works, then your problem is in the iptables security set up. You will need add the web admin port to the iptables file. Don't know about RH9.0 but in RH 8.0 this is located in the /etc/sysconfig directory. The RH8 Line is something like:
-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 8080:8084 --syn -j ACCEPT
You MIGHT be able to do it via RH's security management X app but I generally find this to be too limiting.
GL HF
|LCN|DeadMeat
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Remember, tall grass is better for the environment... so play UT rather than mow!