The following ports are free: 8000, 8100, 8432, 8433, 5000, 8700.
Files and folders in your existing Visualization Platform installation are not in use.
If you installed BIRT iHub Release 3.0 or 3.1 with Visualization Platform and any other BIRT iHub module on the same machine at the same time using the command-line installer, as documented in Installing Multiple Modules on Linux Platforms, ensure that all files and folders associated with all existing BIRT iHub modules are not in use.