These sites do not handle proxy NTLM authentication and require a filter.config authentication bypass rule.
Steps
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In Content Gateway Manager, go to and click Edit File.
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Add the following filtering rule:
Rule Type = Allow
Primary Destination Type = dest_domain
Primary Destination Value = (enter the appropriate value)
.logitech.com
.virtualbox.org
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Click Add. The new rule appears in the table at the top of the page. It should have the format:
Rule Type=Allow , dest_domain=value-you-entered
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Click Apply and then Close.