I uploaded the Bitnami Mantis VM to my ESXi 6 host:
It takes a long time to boot before complaining "could not configure network interface".
The displayed link on the console did not seem to have any helpful advice.
It seems that, in order to make the VM work with ESXi, you need to use the VMware vCenter Standalone Converter. Could you please try that?
Please let us know if this solves the issue.
Javier J. Salmerón