My system log has never shown anything other than entries like this:

2012-12-28 07:14:38,084 INFO 2012-12-28 07:14:38,115 INFO 2012-12-28 07:14:38,115 INFO 2012-12-28 07:14:38,225 INFO 2012-12-28 07:14:43,475 INFO 2012-12-28 07:14:55,538 INFO 2012-12-28 07:14:55,632 INFO 2012-12-28 07:14:55,679 INFO 2012-12-28 07:14:55,679 INFO 2012-12-28 07:14:55,679 INFO 2012-12-28 07:14:55,694 INFO 2012-12-28 07:14:55,694 INFO 2012-12-28 07:14:55,694 INFO 2012-12-28 07:14:55,710 INFO 2012-12-28 07:14:55,710 INFO 2012-12-28 07:14:55,725 INFO 2012-12-28 07:14:55,725 INFO 2012-12-28 07:14:55,725 INFO 2012-12-28 07:14:55,960 INFO 2012-12-28 07:14:56,069 INFO 2012-12-28 07:14:59,288 INFO 2012-12-28 07:15:08,304 INFO 2012-12-28 07:15:08,304 INFO 2012-12-28 07:15:58,837

I am not working with recurring payments with Site Membership Pro.

The table mp_PayPalLog has entries for every single transaction that I attempted, so the PDTHandler is successfully writing to the database.  

There are 3 config files located in the '/Setup/ProviderConfig/paypalpdthandlers' folder: 000_placeholder.config, sts-memberpro-paypalpdthandler.config, and webstorepaypalpdthandler.config.

mp_PayPalLog shows that Provider used was the WebStorePayPalHandler.

Here is the entry for the SerializedObject column:

<?xml version="1.0" encoding="utf-16"?>

<Cart>

   <CartGuid>16f85999-7536-4c5e-bf77-b041717e3750</CartGuid>

  <StoreGuid>db83de6e-6ac6-43a7-b62f-32328e7f23d5</StoreGuid>

  <ClerkGuid>00000000-0000-0000-0000-000000000000</ClerkGuid>

  <CartOffers>

    <CartOffer>

      <ItemGuid>908a79d0-d167-44a6-8838-8b404e5a1e3c</ItemGuid>

      <CartGuid>16f85999-7536-4c5e-bf77-b041717e3750</CartGuid>

      <OfferGuid>cd6a4364-c78f-4a0c-a2ae-5f1d7a1c5423</OfferGuid>

      <TaxClassGuid>6d9569a6-614a-4da9-bb41-e2abd7144742</TaxClassGuid>

      <OfferPrice>0.0100</OfferPrice>

      <Tax>0.0000</Tax>

      <AddedToCart>2012-12-28T01:18:28.323</AddedToCart>

      <Quantity>1</Quantity>

      <IsDonation>false</IsDonation>

    </CartOffer>

  </CartOffers>

  <SerializedCartOffers> &lt;ArrayOfAnyType&gt; &lt;anyType xmlns:q1="http://www.w3.org/2001/XMLSchema" d2p1:type="q1:string" xmlns:d2p1="http://www.w3.org/2001/XMLSchema-instance"&gt; &amp;lt;CartOffer&amp;gt; &amp;lt;ItemGuid&amp;gt;908a79d0-d167-44a6-8838-8b404e5a1e3c&amp;lt;/ItemGuid&amp;gt; &amp;lt;CartGuid&amp;gt;16f85999-7536-4c5e-bf77-b041717e3750&amp;lt;/CartGuid&amp;gt; &amp;lt;OfferGuid&amp;gt;cd6a4364-c78f-4a0c-a2ae-5f1d7a1c5423&amp;lt;/OfferGuid&amp;gt; &amp;lt;TaxClassGuid&amp;gt;6d9569a6-614a-4da9-bb41-e2abd7144742&amp;lt;/TaxClassGuid&amp;gt; &amp;lt;OfferPrice&amp;gt;0.0100&amp;lt;/OfferPrice&amp;gt; &amp;lt;Tax&amp;gt;0.0000&amp;lt;/Tax&amp;gt; &amp;lt;AddedToCart&amp;gt;2012-12-28T01:18:28.323&amp;lt;/AddedToCart&amp;gt; &amp;lt;Quantity&amp;gt;1&amp;lt;/Quantity&amp;gt; &amp;lt;IsDonation&amp;gt;false&amp;lt;/IsDonation&amp;gt; &amp;lt;/CartOffer&amp;gt;&lt;/anyType&gt; &lt;/ArrayOfAnyType&gt;</SerializedCartOffers> 

  <UserGuid>8389160e-1edb-4dbd-a39e-57774582acf3</UserGuid>

  <SubTotal>0.0100</SubTotal>

  <ShippingTotal>0.0000</ShippingTotal>

  <TaxTotal>0.0000</TaxTotal>

  <Discount>0.0000</Discount>

  <OrderTotal>0.0100</OrderTotal>

  <Created>2012-12-28T01:18:28.247</Created> 

  <CreatedFromIP>68.98.29.78</CreatedFromIP>

  <LastModified>2012-12-28T01:18:28.48</LastModified>

  <LastUserActivity>2012-12-28T01:18:28.247</LastUserActivity>

  <DiscountCodesCsv /> <CustomData />

</Cart>

 

So, it looks like the issue does not reside with the PDTHandler, but with the '/WebStore/OrderDetail.aspx' page, since I assume that is where the PDT handler is supposed to redirect.  Right?

Using your configuration link, I solved the log4net issue.  However, in the table 'mp_PayPalLog', the rawresponse column is blank for all transactions.  If there should be rows using the site membership provider, then it looks as if those two attempts never posted anything to the database.

 

As stated before, here are my installation details:

MojoPortal Version: 2.3.9.3 MSSQL
Operating System: Microsoft Windows NT 6.1.7601 Service Pack 1
ASP.NET Info: Running in Partial Trust
Server Time Zone: Central Standard Time
Server Local Time: (GMT -6) 12/28/2012 7:07:19 AM
Greenwich Mean Time: (GMT/UTC)12/28/2012 1:07:19 PM

Before I try another sample transaction, I noticed something interesting.  I saw some info messages appearing in the system log.  I decided to look at the tasks queue and I found this:

Task Queue History

  Task Name Queued Started Last Update Completed Progress
     WebTaskManager 12/28/2012 7:28 AM 12/28/2012 7:28 AM 12/28/2012 8:11 AM 1/1/0001 12:00 AM 50%
     WebTaskManager 12/28/2012 7:23 AM 12/28/2012 7:23 AM 12/28/2012 7:28 AM 12/28/2012 7:28 AM 100%
     Site Membership Management Task 12/28/2012 4:40 AM 12/28/2012 8:06 AM 12/28/2012 8:07 AM 1/1/0001 12:00 AM 50%

There are two running tasks that are only 50% complete.  One of these is for Site Membership Management.  1. What task is this? and 2. Can I safely delete/abandon it before running a test membership purchase?

Okay, so here are the results of the System Log after running another test transaction:

System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 23.63.210.234:443
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
   at System.Net.HttpWebRequest.GetRequestStream()
   at mojoPortal.Business.WebHelpers.PaymentGateway.PayPalStandardPaymentGateway.ValidateIPN()
   at mojoPortal.Web.Services.PayPalIPNHandler.Verify(String ipnForm)
   at mojoPortal.Web.Services.PayPalIPNHandler.HandleRequest()
2012-12-28 09:47:13,362 ERROR mojoPortal.Web.Services.PayPalPDTHandler - System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 23.63.210.234:443
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
   at System.Net.HttpWebRequest.GetRequestStream()
   at mojoPortal.Business.WebHelpers.PaymentGateway.PayPalStandardPaymentGateway.ValidatePDT()
   at mojoPortal.Web.Services.PayPalPDTHandler.Verify(String transactionId)
   at mojoPortal.Web.Services.PayPalPDTHandler.HandleRequest() 

 

It's not a problem on my end.  Looks like PayPal server isn't responding.