As ESXi tries to network boot the following error message appears when accessing the URL with the postfix "/vmw/rbd/tramp"
"Could not boot image: Invalid argument (http://ipxe.org/err/1c0de8)"
VMware vCenter Server 8.0 U2
iPXE's implementation cannot handle the TLS handshake when communicating to vCenter in cases where the root certificate authority in the vCenter has been replaced.https://github.com/ipxe/ipxe/issues/407
This issue is fixed in vCenter Server 8.0 U3.
Workaround for vCenter Server 8.0 U2:
To workaround the issue, please revert the vCenter root certificate authority to default.