Troubleshoot net boot failure using the API

Hi all,

We are using the API in a simple way to

• Set boot device to net
• Wait a few seconds
• Reset VM
• Wait appr. 10 seconds, set boot device to net.

This is done for many VMs as part of software testing and involves Vsphere 4 and Vsphere 5 clients.

Vsphere 4 VMs not managed through vCenter which the version 5 VMs are.

Appr. one network boot out of twenty constantly fails. The Events log look the same on the failing VM as it does

on a working VM. It's different VMs that fails.

We are pretty sure the boot requests doesn't reach the kickstart server.

Any seen this issue before?
Any clues how to procede the troubleshooting efforts?

Thanks in advance.