The install steps you did look pretty good.
I think the thing to do is to take a look at the logs seen inside of tomcat. From here:
/opt/tomcat6/logs (might be here, but you might have to hunt around for the location).
Then look at the catalina.out log file. There should be an error message in there. And you can post the log to this topic.
Hi, I took a look at your log file and I see two issues.
1) there seems to be a problem with the (sub-system) that runs JasperServer diagnostics (but it might be the case that everything keeps running ok despite this error)(ie it's not a "fatal" error). The default diagnostics port is 10990. And in the log it gives an error message that that port is in use. Maybe there is an application using that port already. You can set <tomcat>/webapps/jasperserver/WEB-INF/js.diagnostic.properties and change "diagnostic.port = 10990" to "diagnostic.port = 10999"
2) You are getting a Java out of memory error. This is a fatal error. And you can fix it by setting JAVA_OPTS memory settings in your tomcat script. I know that sounds a little intimidating ;-) but it is actually straight-forward to do. It is fully described in Chapter 6 of the Install Guide. Which you can find at <js-install>/docs/JasperReports-Server-Install-Guide.pdf.