As we know PNID/hostname change is supported on 6.7 U3 onwards, however while changing the hostname from VAMI, you may encounter errors “Failed to create replication placeholder” and “Network update failed” :
To fix the issue, we need to replace the pnid_utils.py file which is at /usr/lib/applmgmt/networking/py/vmware/appliance/networking/pnid/ location with attached one, restart Appliance mgmt. service and try changing PNID again.