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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:

Download file: winpe.wim from set: pe3x64wim
To: C:\Users\<USER>\AppData\Local\Temp\Installer\Macrium\Windows AIK\Tools\PETools\amd64\winpe.wim
INFO: Http Status : 200
File system supports sparse files
Download successful
Downloaded file 'winpe.wim' failed MD5 check. 


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.


Enable HTTP Byte-Range request

For more information see the following SonicWALL support articles:.


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