Puede que el certificado 'X' no tenga un clave privada capaz de intercambiar claves, o que el proceso no tenga permisos de acceso a la clave privada. Vea la excepción interna para obtener información detallada.
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English version
It is likely that certificate 'X' may not have a private key that is capable of key exchange or the process may not have access rights for the private key. Please see inner exception for detail.
.Net Framework