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Editorial Team
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Asked: 2026-05-24T16:03:40+00:00

My assemblies that wrap a third-party DLL work fine in my windows test harness

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My assemblies that wrap a third-party DLL work fine in my windows test harness app, and they also work fine in a web service when spawned in debug mode (VS 2008 Visual Studio Development Server)! However, the app always crashes when running in the local IIS 7 web server. Here is the crash detail from the event log when running on the local IIS server:

Faulting application w3wp.exe, version
7.0.6001.18000, time stamp 0x47919413, faulting module ntdll.dll, version
6.0.6001.18000, time stamp 0x4791a783, exception code 0xc0000374, fault
offset 0x000aada3, process id 0x990,
application start time
0x01c9b4133281d5d0.

Discussion: I wrote a wrapper around a .NET dll from a third-party (LinkPointTransaction.dll from FirstData), and I wrote some other assemblies that reference that wrapper. As the code is running, a call to the third-party LinkPointTransaction.LinkPointTxn.Send() sends the transaction successfully to FirstData over the internet, but my application crashes w3wp.exe somewhere during that call, before it hits the next line. It does not throw a managed exception that I can see; it just crashes. Works fine everywhere on my machine except in IIS7.

I am running 64bit Vista Home Premium (IIS7), but I enabled 32bit apps in IIS, created a separate AppPool just for this web service, and have forced all of my assemblies to x86. I have tried running the App Pool under my user account with Admin privileges instead of as the Network Service. UAC is turned off. I have tried Integrated and Classic modes. I have explicitly opened the TCP/IP port in my local firewall that the LinkPointTransaction.dll uses to communicate with FirstData. I even have shut my firewall off (behind a router).

With any of these workarounds that I listed, it always works in a Windows app and also in a web service inside the VS Development Server, but never works in the local IIS server.

The AppPool for the IIS website is in Classic mode. (In response to
Gidon)

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1 Answer

  1. Editorial Team

    I asked First Data about the DLLs and being able to run it on IIS7/.NET 4/Win 2008 64-bit. This was their response:

    Thank you for your recent inquiry regarding First Data Global Gateway. The Webservice API is our current solution for 64 bit machines running on IIS 7 as none of the dll files (Linkpointtransaction.dll, LPICOM_6_.dll) will be updated to work with the 64bit server. Webservice API will require to install the client certificate and send the transaction via SOAP request. Additional information on Webservice API is found at http://www.firstdata.com/downloads/marketing-merchant/FDGG-Web-Service-API-v4.0.pdf.

    If you need further clarifications or questions, please contact our support desk via phone number below. Please be advised the API support desk hours is from 9:00AM to 6:00PM EST Mon-Fri.

    This should help others looking for similar information in the future.

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