we must have more to help ?
could you provide the installation log ?
Below document has the solution. Thanks to Betty Neumann
Host <hostname> is not an active hostname
If port 7 is blocked by firewall on the remote host, where the communicating component (Oracle, CMDB host, TrueSight Presentation Server, etc) is installed, the TrueSight Infrastructure Management installer displays the error as Host <hostname> is not an active hostname.
CMDB Host <hostname> is not an active hostname
To resolve this issue, perform any of the following:
• Open port 7 on the remote host
• If you cannot open port 7 due to security constraints, run the TrueSight Infrastructure Management installer with the following command line option:
Install.cmd -J SKIP_PING_VALIDATION_ERROR=true
It would have been better if this was included in below document.