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During the installation of the Web Appliance, you must install a Sophos-generated certificate authority in users' browsers in order to be able to access secure (HTTPS) sites. If you use Mozilla Firefox, you will be prompted to download a certificate. If you failed to click "Trust this CA to identify web sites," you must manually delete the improperly-installed Sophos-generated certificate authority. (See also: Sophos Web Appliance: Installing the Sophos-Generated Certificate Authority in your Users' Browsers)
Manually Deleting an Improperly Installed Sophos-generated certificate authority
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