title: Issue with Paypal Payments Pro
body: <p>I am implementing an online store for the last few months and have it successfully connected to the Sandbox of paypal for paypal payments pro gateway. It worked flawlessly since the beginning.</p>
  
  <p>Since over the weekend it is not working anymore. The store gives me the following error:</p>
  
  <pre>
      ERROR CALLING PAYMENT GATEWAY
  
      The trace gives me this error:
  
      Could not create SSL/TLS secure channel
  
      Page URL:/checkoutreview.aspx  Source:System.Web.Services  Message:The request was aborted: Could not create SSL/TLS secure channel.
    Stack Trace:
       at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
       at System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
       at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
       at AspDotNetStorefrontGateways.Processors.PayPalAPIAASoapBinding.DoDirectPayment(DoDirectPaymentReq DoDirectPaymentReq) in C:\Development\Natrol\AspDotNetStorefront\ASPDNSFGateways\PayPalSvcAPIv30.cs:line 956
       at AspDotNetStorefrontGateways.Processors.PayPal.ProcessCard(Int32 OrderNumber, Int32 CustomerID, Decimal OrderTotal, Boolean useLiveTransactions, TransactionModeEnum TransactionMode, Address UseBillingAddress, String CardExtraCode, Address UseShippingAddress, String CAVV, String ECI, String XID, String&amp; AVSResult, String&amp; AuthorizationResult, String&amp; AuthorizationCode, String&amp; AuthorizationTransID, String&amp; TransactionCommandOut, String&amp; TransactionResponse) in C:\Development\Natrol\AspDotNetStorefront\ASPDNSFGatewayProcessors\GatewayPayPal\PayPal.cs:line 415
       at AspDotNetStorefrontGateways.GatewayTransaction.CallGateway(String gateway) in C:\Development\Natrol\AspDotNetStorefront\ASPDNSFGateways\GatewayTransaction.cs:line 205
       at AspDotNetStorefrontGateways.GatewayTransaction.Process() in C:\Development\Natrol\AspDotNetStorefront\ASPDNSFGateways\GatewayTransaction.cs:line 176 
  </pre>
  
  <p>What is going on here ? Any idea what happened and how to solve it ? Why would it break all of a sudden ?</p>
  
  <p>thanks,
  Michael</p>