Unable To Download Pxe Variable File. Exit Code 14 Sccm =link= -
The SCCM error "Unable to download PXE variable file. Exit code 14" typically indicates a network error that has interrupted the operation, often caused by missing or incorrect network drivers in the WinPE boot image. This error occurs when WinPE cannot establish a connection to the Management Point (MP) to retrieve the variables required for the task sequence. Primary Troubleshooting Steps
To resolve this, follow these high-priority steps derived from expert community advice on Reddit and Stack Overflow: Verify Network Connectivity in WinPE:
On the failing client, press F8 immediately when WinPE loads (ensure "Enable command support" is checked in your boot image properties).
Run ipconfig. If you do not see a valid IP address or any network adapter listed, you are missing the required NIC drivers for that specific hardware model. Update the Boot Image:
Identify the network card for the specific device (e.g., a new Dell Latitude model).
Download the correct WinPE-compatible NIC driver from the manufacturer and inject it into your boot image in the SCCM console.
Ensure the boot image is redistributed to all relevant Distribution Points (DPs). Check Network Infrastructure:
Spanning Tree Protocol (STP): If the network switch has STP enabled, the port may take too long to transition to a forwarding state, causing WinPE to time out. Enable PortFast on the switch port.
IP Helpers: 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:
Inspect the smsts.log file, typically located at X:\windows\temp\smstslog\smsts.log in WinPE, for more detailed error codes like 0x8004016c or 0x80004005. Quick Summary of Exit Code 14 Causes
Troubleshooting SCCM Error: "Unable to download PXE variable file. Exit code 14"
If you are seeing the error "Unable to download PXE variable file" with Exit Code 14 in your SMSTS.log, your Task Sequence is failing before it even really begins. This error specifically indicates that the SCCM client cannot retrieve the variables.dat file from the Management Point (MP). What Causes Exit Code 14?
In the context of SCCM PXE booting, Exit Code 14 typically maps to a "Not Found" or "Access Denied" issue during the HTTP/HTTPS request. Essentially, the WinPE environment is asking the Management Point for the policy and instructions (the variable file), but the MP is saying "I don't have it" or "You aren't allowed to see it." 1. Check the Date and Time (The Most Common Culprit)
Because PXE communication often relies on certificates (especially in HTTPS/PKI environments), the device's BIOS/UEFI time must match the server time.
The Fix: Restart the machine, enter the BIOS, and ensure the date and time are correct. If the clock is off by more than 5 minutes, the MP will reject the request, resulting in Exit Code 14. 2. Verify Management Point (MP) Health unable to download pxe variable file. exit code 14 sccm
If the MP is overwhelmed or the IIS services are down, it won't serve the variable file.
The Fix: Check the MP_Control.log on your Primary Site server. Ensure the MP is healthy. You can also try to browse to http:// from another machine to see if the MP responds. 3. Clear Required PXE Deployments
If the device was previously imaged and the Task Sequence was marked as "Required," SCCM might think the job is already done or stuck.
The Fix: Right-click the Device or the Collection in the SCCM Console and select "Clear Required PXE Deployments." This resets the flag and allows the device to request the variable file fresh. 4. Boundary Group Issues
If the device is booting into WinPE but its IP address isn't assigned to a Boundary Group associated with a Management Point, the download will fail.
The Fix: Verify the IP address the device received in WinPE (hit F8 and type ipconfig). Ensure that IP range is explicitly defined in your SCCM Boundaries and attached to the correct Boundary Group. 5. Network Access Account (NAA) or Permissions
In some configurations, the device needs to authenticate to pull the variables.
The Fix: Ensure your Network Access Account is configured correctly and the password hasn't expired. Additionally, if you are using Enhanced HTTP or PKI, ensure the certificates are valid and the MP is correctly configured to accept communication from "Workgroup" computers (which devices are during the PXE phase). 6. Examine the SMSTS.log To get the "smoking gun," you must look at the log file. While in WinPE, press F8 to open the Command Prompt. Navigate to X:\Windows\Temp\SMSTSLog\smsts.log.
Look for the specific URL it is trying to reach. If you see a 404 (Not Found) or 403 (Forbidden), you know the issue is IIS/Permissions related. Summary Checklist BIOS Time: Is it synced with the server? MP Status: Is IIS running on the Management Point? Deployment: Did you "Clear Required PXE Deployments"?
Boundaries: Does the device's current IP belong to a Boundary Group?
The error "Unable to download PXE variable file" with Exit Code 14 in Microsoft Configuration Manager (SCCM/ConfigMgr) typically indicates a network-level failure where the WinPE environment cannot communicate with the Management Point (MP) to retrieve the task sequence variables. Exit Code 14 specifically translates to "A network error interrupted the operation". Primary Causes
Missing Network Interface Card (NIC) Drivers: The most frequent cause. Even if the machine initially PXE boots, it may lose network connectivity once it transitions into the WinPE environment if the boot image does not contain the specific NIC drivers for the hardware.
Spanning Tree Protocol (STP) Issues: If the network switch has STP enabled without PortFast, the port may take too long to transition to a forwarding state. WinPE times out before the network is ready to pull the .dat variable file.
IP Helper or Subnet Issues: If the client and the Distribution Point (DP) or MP are on different subnets, improperly configured IP helpers can prevent the client from finding the necessary resources after the initial boot. The SCCM error "Unable to download PXE variable file
PXE Responder Configuration: A corrupted or misconfigured PXE responder service on the Distribution Point can lead to intermittent download failures. Troubleshooting Steps Verify IP Connectivity (F8): Enable command support on your boot image properties. Press F8 when the error appears to open a command prompt.
Run ipconfig. If you have no IP address or no network adapter is listed, you are missing NIC drivers in your boot image. Test Driver Compatibility:
If ipconfig shows no adapter, identify the correct driver and use the drvload command to manually load it. If connectivity returns, inject that driver into your boot image in the SCCM Console. Check Switch Configuration:
Consult your network team to ensure PortFast is enabled on the client's switch port to bypass STP listening/learning delays. Refresh PXE Responder:
On the Distribution Point properties, try unchecking "Enable PXE support for clients," waiting for it to uninstall (monitor distmgr.log), and then re-enabling it. This often fixes service-level glitches. Review Logs:
Check SMSTS.log on the client (located at X:\Windows\Temp\SMSTSLog\smsts.log) for more detailed error codes, such as 0x8004016c, which further confirms a failure to reach the Management Point. Advanced Solutions
Certificate Mismatch: Ensure the IssuingCertificateList registry key on the DP matches the one on the Management Point.
Block Size Adjustment: If the network is slow or unreliable, reducing the TFTP block size on the PXE-enabled DP can sometimes stabilize the download.
The error "Unable to download PXE variable file" with Exit Code 14 (often followed by 0x8004016c) indicates that a network interruption occurred immediately after the boot image loaded. This prevents the client from downloading the environment variables (.dat file) required to start the Task Sequence wizard. Immediate Troubleshooting Steps Verify Network Connectivity (F8 Prompt):
Enable Command Support on your boot image properties in the SCCM console. Press F8 when the error appears to open a command prompt.
Run ipconfig to see if the device has a valid IP address. If it shows 0.0.0.0 or no adapter, you are missing NIC drivers in your boot image.
If you have an IP, try to ping your Distribution Point (DP) or Management Point (MP). Check for Spanning Tree (STP) Delays:
If the device gets an IP after a few minutes but fails initially, the network switch may be performing loop checks.
Solution: Ask your network team to enable PortFast on the specific switch ports to skip these checks. Common Solutions Go to Administration > Site Configuration > Sites
"Unable to download PXE variable file. Exit code 14" typically indicates a network communication failure
between the client machine and the Management Point (MP) or Distribution Point (DP)
. 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)
when the error appears (ensure "Enable command support" is checked in your Boot Image properties). ipconfig /all
. If you have no IP or a 169.254.x.x address, the boot image is likely missing the Network Interface Card (NIC) drivers for that specific hardware model. Verify IP Helpers & DHCP
Ensure IP Helpers are correctly configured to point to both the DHCP server and the PXE-enabled DP if the client is on a different subnet. If using a switch with Spanning Tree Protocol (STP), enable
on the client's port to prevent the 30-second delay that often causes WinPE to time out while requesting variables. Toggle PXE Responder
If the PXE server and client are on the same subnet, try unchecking and re-checking "Enable PXE responder without Windows Deployment Service" on the Distribution Point properties in the SCCM console. Microsoft Learn Common Causes & Solutions
The error "Unable to download PXE variable file. Exit code 14" in SCCM typically indicates that a network operation was interrupted. This occurs during the WinPE phase when the client attempts to download the variables.dat file from the Management Point (MP) or Distribution Point (DP) but loses network connectivity. Common Causes & Troubleshooting
2. Network Access Account (NAA) Permissions
The Network Access Account is used by the client in WinPE to access content on the distribution point. While PXE booting, the variable file is accessed via SMB (or HTTP depending on configuration). If the NAA is misconfigured or locked out, the download fails.
Verification steps:
- Go to Administration > Site Configuration > Sites.
- Right-click your site > Configure Site Components > Software Distribution.
- Check the Network Access Account tab.
- Ensure the account is valid (not expired, password correct) and has Read access to the DP content library.
Common mistake: Using a domain admin account that gets locked out due to frequent authentication from many PXE clients.
Family 1: The "Unknown Computer" Identity Crisis (Most Common)
SCCM does not automatically trust every PXE client. A computer must be represented as an object in the SCCM database.
- The Problem: You are deploying to a brand-new computer. It is "Unknown" to SCCM. You have not imported the MAC address, and the SMBIOS GUID does not match any existing record. The MP tries to generate a
variables.datfor a non-existent client and returns "File Not Found." - The Fix: Ensure the "Unknown Computer" objects are enabled. Navigate to Assets and Compliance > Device Collections > All Unknown Computers. Right-click the x86 and x64 objects and ensure they are not expired or disabled. Alternatively, import the computer’s MAC address manually.
Part 5: The Step-by-Step Resolution Guide
Follow this sequence to resolve Exit Code 14 efficiently.