Another application is using port 2323 which is the default Linux agent util port so you need to update the util port without re-installing the agent
You will need to su to sisips to run this tool-
su - sisips -c "./opt/Symantec/sdcssagent/IPS/sisipsconfig.sh
To update the util port type the following:
sisipsconfig.sh -u portnumber
For more information on using the sisipsconfig tool, see the following article:
https://knowledge.broadcom.com/external/article/151857/command-line-options-for-the-sisipsconfi.html