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Brad's TechTips - SonicWall

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SonicWall: Configure a Firewall (TZ series) to Permit WSUS Downloads
 
Occasionally, SonicWall firewalls will block WSUS downloads. You can correct this by accessing a "hidden" page in the SonicWall interface, as follows:
  1. Logon to the SonicWall interface.
     
  2. Change the file name at the end of the URL to diag.html.
     
  3. Check the "Enable HTTP Byte-Range requests with Gateway AV" checkbox.
     
  4. Click the Apply button to save changes.