. This usually occurs after the boot image has loaded into WinPE but before the Task Sequence wizard can start, as the client fails to download the file containing its environment variables. Quick Troubleshooting Steps Check Network Connectivity (F8 Shell)
As the single most common cause of this error, driver issues must be examined thoroughly.
| Symptom | Most Likely Cause | Suggested Solution | |---|---|---| | New hardware model not working | Missing NIC drivers | Add correct drivers to boot image (Solution 1) | | Works on some DPs but not others | Corrupted PXE role on specific DP | Repair PXE role on affected DP (Solution 2) | | Intermittent failures on same hardware | Network issue (IP release, switch config) | Check IP helpers, enable PortFast (Solution 5) | | All deployments failing after DP upgrade | DP disk space or corruption | Clean up DP space, rebuild PXE role (Solution 4 + 2) | | Computer already exists in SCCM | Known device with no TS advertised | Delete computer record (Solution 6) | | Nothing else works | Corrupted boot image | Create fresh boot image (Solution 7) |
Verify the client's IP address falls within an active SCCM Boundary. Ensure that Boundary is associated with a Boundary Group that has the Management Point site system role assigned. unable to download pxe variable file. exit code 14 sccm
for your hardware manufacturer:
:
The device downloads and loads the WinPE boot image ( boot.wim ) into a RAM disk ( X:\ ) over TFTP. | Symptom | Most Likely Cause | Suggested
Add the MAC address of the shared USB adapter/docking station to the exclusion list so SCCM ignores it for device identification.
Essentially, the system is trapped in a loop: it loads the boot image, attempts to contact the server for further instructions, but fails during the memory allocation process, causing it to retry cyclically.
ipconfig /all
If your SCCM environment enforces HTTPS or Enhanced HTTP, communication relies heavily on certificates. Certificates will fail validation if the client's time is wrong.
You will typically see one of three root causes detailed in the log lines above the exit code. Common Causes and Their Solutions 1. Incorrect Date and Time Configuration (SSL/TLS Failure)
: If the client is on a different subnet than the DP, verify that IP Helpers are correctly configured on your routers. Review the Log Files : Add the MAC address of the shared USB
The most detailed evidence lives in X:\Windows\temp\SMSTSLog\smsts.log . You can access it from the F8 command prompt with:
The "Unable to download PXE variable file. Exit code=14" error can be frustrating, but with methodical troubleshooting, it's almost always solvable. —that's the root cause in the majority of cases. From there, work through network configuration and DP health.