!!link!! Pxe Variable File. Exit Code 14 Sccm - Unable To Download

The "Unable to download PXE variable file. Exit code 14" error is a common roadblock during SCCM Task Sequence deployments. It typically occurs during the initial boot phase when the client machine fails to retrieve its configuration data from the Management Point. Understanding the Error

In the SCCM workflow, the client contacts the PXE responder to get boot files. Once the WinPE environment loads, it attempts to download a variables file (variables.dat) which contains specific instructions for the Task Sequence. Exit code 14 specifically indicates a "Not Found" or "Access Denied" error during this HTTP/HTTPS request. Common Causes

Time and Date Mismatch: If the client's BIOS clock is significantly different from the Management Point's time, the SSL/TLS handshake (if using HTTPS) or policy request will fail.

Missing Task Sequence Deployment: The device may not be a member of a collection that has a Task Sequence deployed as "Available" or "Required" for PXE/Media.

Boundary Group Issues: The client may not be within a defined boundary, or the boundary group lacks an assigned Management Point or Distribution Point.

Certificate or PKI Issues: If your environment uses HTTPS/Enhanced HTTP, an untrusted or missing certificate will block the download.

Network Blockage: Firewalls or set-top boxes might be stripping HTTP headers or blocking ports 80/443 between the client and the MP. Troubleshooting Steps

Verify Task Sequence DeploymentEnsure the Task Sequence is deployed to the "All Unknown Computers" collection (if it is a new machine) or the specific collection containing the device. Check that the deployment is enabled and set to "Make available to configuration manager clients, media, and PXE."

Check System ClockRestart the client machine and enter the BIOS/UEFI settings. Ensure the date, time, and time zone are correct. A discrepancy of more than five minutes is enough to trigger Exit Code 14.

Examine SMSTS.logThe log file is your best source of truth. While in WinPE, press F8 (if command support is enabled) and navigate to X:\Windows\Temp\SMSTSLog\smsts.log. Look for the specific URL the client is trying to reach. Test that URL from another machine to see if it returns a 404 or 403 error.

Validate Boundary GroupsVerify 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.

Review MP Control ManagerOn the SCCM server, check mpcontrol.log. If the Management Point is having issues responding to any policy requests, PXE variable downloads will fail globally across your site. Summary of Solutions Sync the BIOS clock with the server time. Re-deploy the Task Sequence to the appropriate collection. Add the client's IP range to a valid Boundary Group.

Ensure the Management Point is healthy and reachable over port 80/443. To help you fix this quickly, could you tell me: Are you using HTTPS or Enhanced HTTP? Is this happening to one machine or all machines? Do you have F8 Command Support enabled to check the logs?

Troubleshooting the "Unable to Download PXE Variable File. Exit Code 14" Error in SCCM

System Center Configuration Manager (SCCM) is a powerful tool for managing and deploying operating systems, applications, and updates across an organization. However, like any complex system, it can encounter errors and issues that can be challenging to troubleshoot. One such error is the "Unable to download PXE variable file. Exit code 14" error, which occurs during the PXE (Preboot Execution Environment) boot process. In this article, we'll explore the causes of this error and provide step-by-step guidance on how to troubleshoot and resolve it.

Understanding PXE and SCCM

Before diving into the error, let's briefly review the PXE process and how it relates to SCCM. PXE is a protocol that allows a computer to boot from a network location, rather than from a local hard drive. This is useful for deploying operating systems, as it enables technicians to boot a computer from a network location and install an OS without requiring a local installation media.

SCCM uses PXE to deploy operating systems to computers. When a computer is configured to boot from the network, it contacts the SCCM server to request a boot image. The SCCM server then provides the computer with a boot image, which includes the necessary files to complete the installation.

The "Unable to Download PXE Variable File. Exit Code 14" Error unable to download pxe variable file. exit code 14 sccm

The "Unable to download PXE variable file. Exit code 14" error occurs when a computer attempts to boot from the network using PXE, but is unable to download the necessary variable file from the SCCM server. This error is typically accompanied by a boot failure, and the computer may display an error message similar to:

"Unable to download PXE variable file. Exit code 14"

Causes of the Error

There are several causes of the "Unable to download PXE variable file. Exit code 14" error, including:

Misconfigured SCCM settings: Incorrect or missing settings in SCCM can prevent the PXE boot process from completing successfully.
DHCP issues: DHCP (Dynamic Host Configuration Protocol) is used to assign IP addresses to computers on a network. Issues with DHCP can prevent the computer from obtaining the necessary IP address to boot from the network.
PXE server configuration: The PXE server may not be properly configured, or the necessary files may not be present.
Network connectivity issues: Network connectivity problems can prevent the computer from communicating with the SCCM server.
Boot image configuration: The boot image may not be properly configured, or the necessary files may not be present.

Troubleshooting Steps

To troubleshoot the "Unable to download PXE variable file. Exit code 14" error, follow these steps:

Verify SCCM settings:
- Ensure that the SCCM server is properly configured for PXE booting.
- Verify that the PXE server is configured to use the correct boot image.
- Check the SCCM logs for errors related to PXE booting.
Check DHCP settings:
- Verify that DHCP is functioning correctly on the network.
- Ensure that the DHCP server is assigning IP addresses to computers on the network.
- Check the DHCP logs for errors related to IP address assignment.
Verify PXE server configuration:
- Ensure that the PXE server is properly configured and that the necessary files are present.
- Verify that the PXE server is configured to use the correct boot image.
Check network connectivity:
- Verify that the computer can communicate with the SCCM server.
- Check the network cables and switches to ensure that they are functioning correctly.
Verify boot image configuration:
- Ensure that the boot image is properly configured and that the necessary files are present.
- Verify that the boot image is configured to use the correct SCCM server.

Advanced Troubleshooting Steps

If the above steps do not resolve the issue, you may need to perform more advanced troubleshooting:

Enable PXE debugging:
- Enable PXE debugging on the SCCM server to capture detailed logs.
- Use the logs to identify the specific cause of the error.
Use the SCCM console:
- Use the SCCM console to monitor the PXE boot process.
- Check the console for errors related to PXE booting.
Check the SCCM logs:
- Check the SCCM logs for errors related to PXE booting.
- Use the logs to identify the specific cause of the error.

Conclusion

The "Unable to download PXE variable file. Exit code 14" error can be a challenging issue to troubleshoot, but by following the steps outlined in this article, you should be able to identify and resolve the cause of the error. Remember to verify SCCM settings, check DHCP settings, verify PXE server configuration, check network connectivity, and verify boot image configuration. If necessary, perform advanced troubleshooting steps, such as enabling PXE debugging, using the SCCM console, and checking the SCCM logs.

Additional Resources

For more information on troubleshooting SCCM errors, check out the following resources:

Microsoft Support: System Center Configuration Manager (SCCM) troubleshooting
SCCM Central: Troubleshooting SCCM Errors
Reddit: SCCM Error Codes and Troubleshooting

By following the steps outlined in this article and using the additional resources provided, you should be able to resolve the "Unable to download PXE variable file. Exit code 14" error and get your SCCM deployment back on track.

The Scenario

It's a typical Monday morning for John, a systems administrator at a large organization. He's responsible for managing the SCCM infrastructure, which includes deploying operating systems and applications to thousands of endpoints across the company. As he's sipping his coffee, he receives a call from the help desk about a PXE boot issue with a new computer that was added to the network over the weekend.

The user is trying to image the computer using SCCM's OS deployment feature, but the process is failing. The computer is able to boot from the network and obtain an IP address, but when it tries to download the PXE variable file, it fails with an exit code 14.

The Error

John checks the SCCM console and sees that the computer is listed in the "Failed" state. He looks at the SMSPXE.log file on the PXE server and finds the following error: The "Unable to download PXE variable file

Failed to download PXE variable file. Exit code: 14

He also checks the client's log file (SMSTS.log) and finds:

Failed to get the variable file. Code 0x0000000E

The Investigation

John starts by investigating the possible causes of the issue. He knows that exit code 14 typically indicates a "file not found" error. He checks the SCCM console and sees that the PXE variable file is indeed present on the PXE server.

Next, he checks the permissions on the PXE variable file and ensures that the computer account (also known as the machine account) has read access to the file. He also verifies that the file is not corrupted and that the hash values match.

The Root Cause

After further investigation, John discovers that the issue is caused by a mismatch between the computer's BIOS and the PXE boot file. The computer's BIOS is set to use UEFI booting, but the PXE boot file is configured for legacy BIOS booting.

In SCCM, the PXE boot file is used to boot the computer and initiate the OS deployment process. However, if the computer's BIOS is set to use UEFI booting, it will not be able to read the legacy BIOS PXE boot file.

The Fix

To resolve the issue, John updates the PXE boot file to support UEFI booting. He does this by:

Creating a new PXE boot file that supports UEFI booting.
Updating the SCCM console to use the new PXE boot file.
Ensuring that the computer's BIOS is set to use UEFI booting.

The Resolution

After making the changes, John retries the OS deployment and the computer is able to successfully boot from the network and download the PXE variable file. The exit code 14 error is resolved, and the deployment completes successfully.

The Lesson Learned

John learns that it's essential to ensure that the computer's BIOS and the PXE boot file are compatible to avoid PXE boot issues. He also realizes the importance of monitoring the SCCM logs and investigating errors promptly to minimize downtime and ensure smooth deployments.

From then on, John makes sure to regularly review the SCCM logs and updates the PXE boot files to support the latest BIOS configurations, ensuring smooth and successful deployments.

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: Misconfigured SCCM settings : Incorrect or missing settings

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

"Unable to download PXE variable file. Exit code=14" typically indicates a network communication failure during the WinPE phase of an SCCM (MECM) OS deployment

. This exit code signifies that the client machine cannot establish or maintain a connection to the Management Point (MP) or Distribution Point (DP) to retrieve the variables.dat Common Root Causes Missing or Incorrect NIC Drivers

: The WinPE boot image lacks the specific network drivers required for the target hardware. Spanning Tree Protocol (STP) Issues

: The network switch port is performing loop checks, causing a delay that makes WinPE time out before receiving an IP address. Network/Routing Misconfiguration : Incorrect IP Helpers

or firewall rules blocking TFTP traffic between the client's subnet and the SCCM servers. PXE Responder Conflicts

: Issues with the "Enable PXE responder without Windows Deployment Service" setting on the Distribution Point. Stack Overflow Troubleshooting & Resolution Steps

Family 3: The Management Point Affinity Failure

The PXE-enabled DP must communicate with a Management Point to generate the variable file.

The Problem: The DP cannot reach the MP (firewall blocking port 443/80), the MP is overloaded, or the DP is assigned to the wrong site.
The Fix: On the DP, review SMSPXE.log (located in SMS_CCM\Logs). Look for lines indicating failure to contact the MP or errors retrieving policy. Also, verify the SMS_MP_CONTROL_MANAGER is healthy on the MP.

Troubleshooting Deep Dive: Resolving "Unable to Download PXE Variable File (Exit Code 14)" in SCCM

3. Verify the PXE Responder Service

If the Distribution Point is overloaded, the PXE Responder service might be dropping requests.

Steps:

Log into your Distribution Point server.
Open services.msc.
Restart the Windows Deployment Services and SCM PXE Responder Service (if installed).
In some cases, removing the PXE role from the DP, waiting 10 minutes, and re-adding it can clear stuck connections.