Overview
While PXE services very rarely have issues, if don't tend to have many issues, you may occasionally run into issues with PXE reps.
Enable logging for Landesk PXE service
If you are having issues, it may be worthwhile to enable logging to help track the issue.
In order to enable logging change the registry key “PxeMtftp_DebugOutToFile_On” under HKLM\Software\INTEL\PXE on the PXE rep to "1". Then, either restrat the computer or the Landesk PXE MTFTP Service. The Log file pxemtftp.log can be found in c:\program files\LANDesk\PXE\System
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External References
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http://community.landesk.com/support/docs/DOC-11704
Troubleshooting PXE
Landesk has a very detailed article with a collection of PXE errors and troubleshotting steps. The article can be found here: http://community.landesk.com/support/docs/DOC-117048358