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Important: Even if the use of certificates makes the risks involved in
remote connections and software installation considerably smaller,
they must be used correctly in order to benefit from increased security.
The existence of a certificate does not offer any protection by itself; the
certificate manager must contain correct, authentic, or trusted
certificates for increased security to be available. Certificates have a
restricted lifetime. If Expired certificate or Certificate not valid yet is
shown even if the certificate should be valid, check that the current
date and time in your device are correct.
Before changing any certificate settings, you must make sure that you really trust
the owner of the certificate and that the certificate really belongs to the listed
owner.
View certificate details and check authenticity
You can only be sure of the correct identity of a server when the
signature and the period of validity of a server certificate have been
checked.
The phone notifies you if the identity of the server is not authentic or if
you do not have the correct security certificate in your phone.
To check certificate details, scroll to a certificate, and select Options >
Certificate details. While opening the certificate details, the phone
checks the validity of the certificate, and one of the following notes may
appear:
Expired certificate — The validity period has ended for the selected
certificate.
Certificate not valid yet — The validity period has not yet begun for the
selected certificate.
Certificate corrupted — The certificate cannot be used. Contact the
certificate issuer.
Certificate not trusted — You have not set any application to use the
certificate.
Change the trust settings
Before changing any certificate settings, you must make sure that you
really trust the owner of the certificate and that the certificate really
belongs to the listed owner.