Notify the administrator of the remote security endpoint about the error and ask the administrator to verify that certificate sent to the IKE daemon for IKEv1 are using RSA signature mode. The administrator of the remote security endpoint should also verify that the key usage and the extended key usage extensions of the certificates that were sent support the creation and verification of digital signatures in an IKE flow. When the key usage extension is present, either the digital signature bit or the nonrepudiation bit must be set. When the key usage extension is present it must allow either any usage or usage with IKE.