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您好，我已经使用自适应方法 (NVP) 调用实施了 Paypal 发票、快速结帐和定期付款服务。它在我的本地系统上使用沙盒帐户运行良好，但在开发服务器上运行良好，并且在我根据请求调用贝宝服务的任何地方都面临问题。

代码

    InvoiceModelAlias.PaymentTermsType paymentTermsType = (InvoiceModelAlias.PaymentTermsType)Enum.Parse(typeof(InvoiceModelAlias.PaymentTermsType),invoice.PaymentTerms.ToUpper());
    InvoiceModelAlias.CreateAndSendInvoiceRequest invoiceRequest = new InvoiceModelAlias.CreateAndSendInvoiceRequest();  
    invoiceRequest.requestEnvelope = new InvoiceModelAlias.RequestEnvelope();
    invoiceRequest.requestEnvelope.errorLanguage = "en_US";
    invoiceRequest.invoice = new InvoiceModelAlias.InvoiceType();
    invoiceRequest.invoice.currencyCode = invoice.CurrencyCode;
    invoiceRequest.invoice.merchantEmail = invoice.MerchantEmail;
    invoiceRequest.invoice.payerEmail = invoice.PayerEmail;
    invoiceRequest.invoice.paymentTerms = paymentTermsType;
    invoiceRequest.invoice.itemList = new InvoiceModelAlias.InvoiceItemListType();
    invoiceRequest.invoice.itemList.item = new List<InvoiceModelAlias.InvoiceItemType>();
    invoiceRequest.invoice.itemList.item.Add(new InvoiceModelAlias.InvoiceItemType(invoice.ItemName, Convert.ToDecimal(invoice.ItemQuantity), Convert.ToDecimal(invoice.ItemAmount)));
    InvoiceAlias.InvoiceService invoiceService;
    InvoiceModelAlias.CreateAndSendInvoiceResponse invoiceResponse = null;
    invoiceService = GetService();
    invoiceResponse = invoiceService.CreateAndSendInvoice(invoiceRequest);
    string ackRsponse = invoiceResponse.responseEnvelope.ack.ToString();

invoiceService.CreateAndSendInvoice(invoiceRequest)

例外

PayPal.Exception.ConnectionException: Invalid HTTP response The underlying connection was closed: An unexpected error occurred on a receive.
   at PayPal.HttpConnection.Execute(String payLoad, HttpWebRequest httpRequest)
   at PayPal.APIService.MakeRequestUsing(IAPICallPreHandler apiCallHandler)
   at PayPal.BasePayPalService.Call(IAPICallPreHandler apiCallHandler)
   at PayPal.Invoice.InvoiceService.CreateAndSendInvoice(CreateAndSendInvoiceRequest createAndSendInvoiceRequest, String apiUserName)
   at PayPal.Invoice.InvoiceService.CreateAndSendInvoice(CreateAndSendInvoiceRequest createAndSendInvoiceRequest)
   at DoPayments.Payments.Invoices.CreateAndSendInvoice(Invoice invoice)

请有人帮我解决这个问题或建议这背后的原因是什么，因为它在本地运行良好，但在开发/生产服务器上却不行。

在快速结帐和定期付款方式的情况下，我也面临同样的问题，如下所示： 

com.paypal.sdk.exceptions.FatalException: The underlying connection was closed: An unexpected error occurred on a receive.
   at com.paypal.sdk.core.nvp.NVPAPICaller.Call(String NvpRequest)
   at com.paypal.sdk.services.NVPCallerServices.Call(String requestnvp)

提前致谢。

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