After installing EID 2.3.0 on Linux, received the following error from the Integrator Server management GUI: "Unlicensed version is not allowed to execute any graph." Carefully followed the instructions using the Installation and Integrator Server Guides.
What do you see when you point your browser to http://<integrator_host>:<tomcat_integrator_port>/clover-license ?
I think I've seen this issue occur where something goes wrong during initial install and the install gets stuck in a bad state. Starting over is sometimes works (aka. delete /clover and /clover-license webapps and .wars and remove the references in the /tmp directory.
This can happen (i can repro this) when deploying clover and clover-license to a Tomcat server running other applications (eg. a Tomcat with EID Studio already deployed), which is not a supported configuration (http://docs.oracle.com/cd/E29805_01/general.230/eid_install/toc.htm#Integrator%20Server%20installation). You can try deploying to a standalone/fresh install of Tomcat.
Yes, i had faced the same problem. pls use two different tomcat servers one for integrator server and other for studio which will be given in the endeca installer package only and change the port numbers of any one of the server in [tomcat_home]/conf/server.xml. After this installation of integrator server becomes an easy job.