Each category label under the logo indicates a test that the product has passed. VPNC stopped issuing logos at the end of 2014 when the organization closed. This list is presented here because it is believed that the interoperability tests are still valid. VPNC Logos IPsec Interoperability — The long-standing IPsec interoperability tests are for "AES Interoperability". In 2006, VPNC introduced the first significant IKEv2 interoperability logos in the IPsec market, "IKEv2 Basic Interoperability.