This issue occurs when Compressed File Handling is set to Action: Block and Applies to: All compressed files.
To resolve the issue, change the Compressed File Handling settings:
- On the IWSVA management console, go to HTTP > Advanced Threat Protection > Policies > Virus Scan Global Policy.
- Click the Virus/Malware Scan Rule tab and go to the Compressed File Handling section.
- Do one of the following:
- Set the action to Pass or Quarantine.
- Select the Compressed files if radio button instead of All compressed files.
You will now be able to untick the Archives option and save the modified settings.