The DBTuna Web GUI will listen on port 8090 by default. If for some reason you need to modify this e.g. if you have a firewall between your client PC and the machine where you have installed DBTuna and are unable to open port 8090. Then you need to do the following:
Open up the following file in a text editor:
[dbtuna install dir]jakarta-tomcat-5.0.28/conf/server.xml
Find the line containing 8090 (there is only one occurrence) and change the number to the desired port.
Following this you will need to re-start the DBTuna processes. To do this you need to:
If Windows
Restart the Windows service named: "DBTuna GUI"
If Linux
Run ./stopDBTuna.sh followed by ./startDBTuna.sh