MS Dynamics SL Credit Card Security Fix

Microsoft Dynamics SL users have encountered a problem in which their application crashes when they attempt to transmit a credit card transaction. The problem is rooted in the TLS (Transport Layer Security) protocol, the cryptographic protocol that provides security over a computer network.

The steps to resolve the issue are as follows:

  1. Open Windows Powershell as an administrator
  2. Run the following script: [Net.ServicePointManager]::SecurityProtocol which should return the following results:

As you can see, only include Tls as opposed to Tls12

  1. Run the following scripts:

Set-ItemProperty -Path ‘HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NetFramework\v4.0.30319’ -Name ‘SchUseStrongCrypto’ -Value ‘1’ -Type DWord

Set-ItemProperty -Path ‘HKLM:\SOFTWARE\Microsoft\.NetFramework\v4.0.30319’ -Name ‘SchUseStrongCrypto’ -Value ‘1’ -Type Dword

  1. Restart Windows Powershell and run the first script once again: [Net.ServicePointManager]::SecurityProtocol, which should now return results that include TLS 1.2

References to TLS 1.2:

Example of Merchant’s requirement to move to TLS 1.2:

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