Renewing Client Certificates on Devices
You cannot extend the expiration dates of existing client certificates.
When you want to continue using Client Certificate Authentication, reissue a client certificate and install it on the devices again.
When the Client Certificate Is within Its Validity Period
This section describes how to issue a new client certificate while keeping the existing client certificate active.
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Click the gear-shaped menu button in the header.
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Click Users & System Administration.
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Click Create & Download.
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Select the department to which a target user belongs.
When the target user does not belong to any department, select "Users Not Yet Assigned" or "All Users".
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Select "Valid".
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Select the checkbox for the user you want.
You can select multiple users.
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Set the expiration date of the client certificate.
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Clear the "Remove existing certificates before re-issuing them" checkbox.
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Click Create.
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Install the client certificate on the user's device.
Installing Client Certificates on Devices
When the Client Certificate Has Expired
When a client certificate has expired, users can no longer access cybozu.com.
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Click the gear-shaped menu button in the header.
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Click Users & System Administration.
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Click Create & Download.
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Select the department to which a target user belongs.
When the target user does not belong to any department, select "Users Not Yet Assigned" or "All Users".
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Select "Expired".
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Select the checkbox for the user you want.
You can select multiple users.
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Set the expiration date of the client certificate.
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Click Create.
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Install the client certificate on the user's device.
Installing Client Certificates on Devices