An apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus, when the computer program code is executed by the at least one processing core, at least to: - participate in establishment of a secured protocol connection, the establishment being initiated by transmitting an initial secured protocol packet, over a first interface, to a correspondent node; and in response to the establishment being initiated: - receive over the first interface a certificate during the establishment of the secured protocol connection; - receive, over a second interface (102, 201C), information concerning the certificate, and - compare the certificate to the information concerning the certificate, the information concerning the certificate being received during the establishment of the secured protocol connection, and the apparatus being configured to receive the certificate and the information concerning the certificate via a network access device external to the apparatus, and the apparatus being configured to, responsive to the information concerning the certificate being determined to be inconsistent with the certificate, abort the establishment of the secured protocol connection, alert the user, or participate in establishing the secured protocol connection over the second interface (102, 201C) by restarting the establishment of the secured protocol connection over the second interface (102, 201C) or by completing the establishment of the secured protocol connection, started over the first interface, by transmitting a response to the certificate via the second interface (102, 201C). - participate in establishment of a secured protocol connection, the establishment being initiated by transmitting an initial secured protocol packet, over a first interface, to a correspondent node; and in response to the establishment being initiated: - receive over the first interface a certificate during the establishment of the secured protocol connection; - receive, over a second interface (102, 201C), information concerning the certificate, and - compare the certificate to the information concerning the certificate, the information concerning the certificate being received during the establishment of the secured protocol connection, and the apparatus being configured to receive the certificate and the information concerning the certificate via a network access device external to the apparatus, and the apparatus being configured to, responsive to the information concerning the certificate being determined to be inconsistent with the certificate, abort the establishment of the secured protocol connection, alert the user, or participate in establishing the secured protocol connection over the second interface (102, 201C) by restarting the establishment of the secured protocol connection over the second interface (102, 201C) or by completing the establishment of the secured protocol connection, started over the first interface, by transmitting a response to the certificate via the second interface (102, 201C).