After upgrading the Domain Manager and the Scalability Servers from 12.9 to 14.0 SP1, the Boot Server on the Scalability Server shows the following status:
'SS bootserver state = "not answering PXE requests" .
Boot server was working prior to the upgrade.
The error can also happen when installing a new 14.0 SP1 scalability server.
In ITCM The "Default Computer Policy" has a setting /Scalability Server/OSIM/ManagedPC/Server/Disable PXE service at start =true.
Modify this policy and set it to 'False'. Wait for sometime for the policy configuration to be propagated down to the Scalability Servers.