Oracle returns redicrect when there is NAT between client and server

I have Oracle 8i on Linux sitting behind a firewall/NAT. I have two Apache webservers that run both Tomcat and WebLogic webapps, also behind the NAT. One of them is on the same machine as the Oracle server. Those all connect just fine. I recently had to load a JBoss/Tomcat webapp (no Apache) outside the NAT which needs to talk to the Oracle server. It's using a JDBC driver, I believe calling on this class: oracle.jdbc.driver.OracleDriver. The configured URL is "jdbc:oracle:thin:@localhost:1521:qlink". Using ethereal (A GUI frontend to the packet sniffer tcpdump, which understands the TNS protocol) showed me that this is the connection request being made: "(DESCRIPTION=(CONNECT_DATA=(SID=qlink)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=oracle)))
(ADDRESS_LIST=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))))". I notice it uses SID, where it seems everything else I've analyzed with Ethereal is using SERVICE_NAME. I was first trying to pipe the data through an SSH tunnel. This technique works with all of Oracle's tools that I have tried it with, and with TOAD. I can connect to this Oracle server with the DBA Studio and sqlplus, over an ssh tunnel. But as soon as this JBoss/Tomcat webapp tries, Oracle returns a REDIRECT message. There are two things that strike me as odd: The REDIRECT message returns the hostname of the Oracle server and a nonstandard port; and the JBoss/Tomcat webapp doesn't seem to do anything about it. I has assumed the TNSLSNR forwarded data between 1521 and the appropirate port for requested databse. The port is the same every time, so I made sure that the hostname/port returned was reachable from the client side. But like I said, the client seemed to just ignore it and hang. Getting desparate, I then tried to open up the Oracle ports on the NAT, and use ipchains to restrict what IPs could connect to it, that yielded the same results. I've seen this webapp work with Oracle running on the same machine, both configured identically. (Running Oracle behind the NAT and using SSH tunnels gives the same configuration for JBoss/Tomcat as if I was running Oracle on the same machine)

I'm pretty uninitiated with Oracle. I don't know how to verify/disprove your guess about the shared server dispatcher, or even what it means. Should I try to pursue the observation that the JDBC client specifies a SID to connect to and everything else specifies a SERVICE_NAME, or is that of little consequence? I'm not sure how to interpret the output from 'lsnrctl serv'. Here's the chunk pertaining to the database in question:
qlink has 3 service handler(s)
DISPATCHER established:120 refused:0 current:120 max:254 state:ready
D000 <machine: sark.unboundtech.com, pid: 15801>
(ADDRESS=(PROTOCOL=tcp)(HOST=sark.unboundtech.com)(PORT=41714))
qlink has 3 service handler(s)
DEDICATED SERVER established:46 refused:0
LOCAL SERVER
DISPATCHER established:0 refused:0 current:0 max:254 state:ready
D001 <machine: sark.unboundtech.com, pid: 15803>
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=sark.unboundtech.com)(PORT=41716))(PRESENTATION=oracle.aurora.server.SGiopServer)(SESSION=RAW))
Presentation: oracle.aurora.server.SGiopServer
The (ADDRESS=...) is what is returned in the redirect. I created the database with dbassist using the default setup type. I'll have a look at listener.log (the name/location of a log file is actually a question I had but forgot to ask, so thanks), I don't know how to check trace output. The webserver is able to resolve the hostname being returned, and knows how to route to it.
Localhost is the correct entry. If you've never used SSH tunnels here's a quick rundown. You can tell most SSH clients to listen on an arbitraty port on your machine, and forward data to a remote IP/port from the other side. So from the webserver, I would say to forward localhost:1521 to localhost:1521 on the oracle server. So for sqlplus, for example, I setup tnsnames.ora to route connections to a particular SERVICE_NAME to localhost:1521, which is forwarded through my SSH connection, to localhost:1521 on the Oracle server. This lets gains me two things, all connections look like localhost, making my firewall rules simpler, and I get encryption through SSH (I know Oracle can do encrypted connections, but some clients might not support it, and I don't know how to set it up yet.) I am able to connect to the database over an SSH tunnel using sqlplus, from the webserver (since I ended up installing Oracle on it), so I know the connection is possible.
After reading that, you might wonder if the hostname:port returned in the redirect were accessible from the web server. They weren't at first, but opening port 1521 and 41714 for sark.unboundtech.com at the NAT, and firewalling requests from IPs other than the webserver, then giving the JDBC config sark.unboundtech.com instead of localhost with an SSH tunnell yielded identical behavior. After recieving the REDIRECT, the JDBC code doesn't seem to do anything except hang, nothing is sent to the location given in the REDIRECT response.

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