Updating connection failed client cert
Client authentication requires a client certificate in x.509 format from a CA.The x.509 format is an industry-standard format for SSL certificates.For example, when a specific user opens a database, use the settings for the user stored in the profile document to change the display of the database.
You might be wondering whether you could use SSL server authentication with Domino basic password authentication to perform the same function as SSL client authentication.
Classes are important when your users receive certificates from external CAs, since you want to make sure that the CA took the utmost precautions when issuing the certificate.
Classes of certificates are of lesser importance when they are issued by an internal CA, since typically you will use already established processes to ensure user identity.
For Microsoft Internet Explorer users, the client certificate is stored in the registry.
In order to verify the user, the Public Address Book on the server that the client accesses must also contain the user's public key.
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Client authentication takes away this restriction and allows you to specify access on an individual basis.