*/
  fun closeLater(errorCode: ErrorCode) {
    if (!closeInternal(errorCode, null)) {
      return // Already closed.
    }
    connection.writeSynResetLater(id, errorCode)
  }

  /** Returns true if this stream was closed. */
  private fun closeInternal(
    errorCode: ErrorCode,
    errorException: IOException?,
  ): Boolean {
    assertLockNotHeld()

        cloneInternal(cloned, this);
        return cloned;
    }

    /**
     * Clone internal fields from one authenticator to another.
     *
     * @param cloned the target authenticator to copy to
     * @param toClone the source authenticator to copy from
     */
    protected static void cloneInternal(NtlmPasswordAuthenticator cloned, NtlmPasswordAuthenticator toClone) {