For mutual authentication, the central-site VPN device requires an identity certificate to authenticate the connection while VPN Client requires a root certificate from the VPN device for authentication. To use mutual group authencation, you need to obtain and import a root certificate. When you select mutual authentication, the VPN Client verifies whether you have a root certificate installed. If not, it prompts you.
Before you continue, you must import a root certificate. For information on importing a certificate, see Importing a Certificate File.
When you have installed a root certificate (if required), follow the steps in Group Authentication.
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