Deployment Server 6.9 SP1 (MP1) was successfully installed and tested ok in the DEV environment. After a month or so when trying to PXE boot, the process would go in a continuous boot (loop).
On investigation of the Deployment console, PXE configuration Utility, we were unable to open the PXE configuration utility to check current settings.
An error message box kept on popping up and said that the PXE manager couldn't connect to the Deployment server and that the services might have stopped and need to be restarted.
First of all we restarted all the services related to the Deployment server and PXE, which brought no luck as we still had the same error as before.
Then a repair of Deployment Server and a reboot of the server was done and no luck with that either.
Finally we did the following in this order which resolved the problem we were experiencing:
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I just ran into this issue on one of our DS servers, and I was able to determine there was some corruption in the PXEManager.ini located in \\%DSSERVER%\Express\PXE\. I stopped the Express service and all of the other PXE services. I fixed the corrupted values...some were set to ascii characters. I just compared it with another server's PXEManager.ini. Restarted the services and that seemed to fix the issue.