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Problem

You may experience Windows PE download errors if your PC is behind a SonicWALL Firewall.

Example error in the Reflect download manager (ReflectDL.exe) log:

 

You may experience this problem if a computer is behind a firewall or behind a proxy server. This problem occurs if one of the following conditions is true:

  • The proxy server environment does not support the HTTP 1.1 range request feature.
  • You are behind a SonicWALL firewall device, and the "Enable HTTP Byte-Range request with Gateway AV"  is not enabled.

Resolution

Enable HTTP Byte-Range request

For more information see the following SonicWALL support articles:. 

https://support.sonicwall.com/kb/sw3789

https://support.sonicwall.com/kb/sw7566

 

Note: If download problems continue after enabling 'HTTP Byte-Range request' then completely disable SonicWALL for the duration of the download

 


References

https://support.microsoft.com/en-gb/help/922330/error-message-when-you-try-to-download-a-file-by-using-the-background-intelligent-transfer-service-content-file-download-failed

https://support.sonicwall.com/kb/sw3789

https://support.sonicwall.com/kb/sw7566

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