When a FortiWeb appliance initiates or receives an SSL or TLS connection, it will use certificates. Certificates can be used in HTTPS connections for:
For example, when it sends alert email via SMTPS or querying an authentication server via LDAPS or STARTTLS, FortiWeb validates the server’s certificate by comparing the server certificate’s CA signature with the certificates of CAs that are known and trusted by the FortiWeb appliance. See Uploading trusted CAs’ certificates and Revoking certificates.
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