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SSL Control enabled with "Detect Certificate signed by an Untrusted CA" causes Windows Update to fail.
01/05/2024 
2 People found this article helpful
141,378 Views
Description
The following article describes how whitelisting the Windows update common names ensures that Windows updates will always run properly.
Cause
Enabling "Detect Certificate signed by an Untrusted CA" in SSL control causes Windows Update get blocked due to untrusted CA which causes HTTPS access denial.
Resolution
Resolution for SonicOS 7.X
This release includes significant user interface changes and many new features that are different from the SonicOS 6.5 and earlier firmware. The below resolution is for customers using SonicOS 7.X firmware.
- Navigate to Network> Firewall>SSL Control
- Go to Custom list> Whitelist
- Under Custom Lists, configure the Whitelist by defining strings for matching common names in SSL certificates. Entries are case-sensitive and are used with pattern-matching. For example, “Sonicwall.com” matches “https://www.sonicwall.com” and “https://mysonicwall.com,” but not “https://www.sonicwall.de.
- To add an entry to the Whitelist for Windows Update, type it into the White List field the following domains:
dl.delivery.mp.microsoft.com
download.microsoft.com.
go.microsoft.com
update.microsoft.com
windowsupdate.microsoft.com
windowsupdate.microsoft.com
- Click Add.
- After that enable- "Detect Certificate signed by an Untrusted CA"
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