HarmonyOS 自定义SSL双向认证报错，SSL is null

static async tlsCheckRemoteCertificate(serverCert: cert.X509Cert): Promise<any> {
  let tls: socket.TLSSocket = socket.constructTLSSocketInstance();
  try {
  const res = await connection.getAddressesByName('https://xxx.cn')
  const net = res[0]
  net.port = 8012
  await tls.bind(net)
  const data = await tls.getRemoteCertificate()

  let encodingBlob: cert.EncodingBlob = {
    // 将证书数据从string类型转换成Unit8Array
    data: data.data,
    encodingFormat: cert.EncodingFormat.FORMAT_DER
  };
  const x509Cert = await cert.createX509Cert(encodingBlob)
  const pubKey = serverCert.getPublicKey();
  await x509Cert.verify(pubKey)
} catch (e) {
  tls.close()
}
}

执行到 const data = await tls.getRemoteCertificate()时，报2303501，SSL is null