Users whose Client Certificate Authentication has been deactivated can access cybozu.com only from sources that is allowed in IP address restrictions settings.

When Client Certificate Authentication is deactivated for some users, the client certificates for them will no longer be available.
To resume using Client Certificate Authentication, issue a client certificate and install it again.

1. Click the gear-shaped menu button in the header.

2. Click Users & System Administration.

3. Click Departments & Users.

4. Enter a display name or a login name of the user in the search box to search the target user.
   Moreover, you can expand the department tree and find the target user.

5. Click the Change button.
   

6. Remove "Client Certificate Authentication" from the available services of the user.
   

7. Click Save.