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Lexmark Forms Printer 2581n+

Lexmark Forms Printer 2581n+

How to install and use the Twack_32 app and capture Lexmark NW Twain and ScanCore logs


This article documents installing and using the Twack_32 app and capturing Lexmark NW Twain and ScanCore logs.


Make sure to prepare the following beforehand:

  • Twain Group provided Twack_32 app​
  • Lexmark Twain Driver
  • Lexmark printer updated to the latest firmware version


Capturing logs

  1. Open Regedit.

  2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Lexmark\NetworkTwain\Logger.

  3. Change the ​​​​​​StartLog​​​​ value to ​​​​​​data 1​​​​. 

  4. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Lexmark\NetworkTwain\DRS\Logger.

  5. Change the ​​​​​​StartLog​​​​ value to ​​​​​​data 1​​​​. 

  6. Reproduce the scan issue.

Expected Result

The required ​​​​​​NetTwain.log​​​​ and ​​​​​​ScanCoreLog.log​​​​ log files can now be found in the ​​​​​​C:\ProgramData folder​​​​. 

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