ByteScout Extractor SDK fails with ASP.NET on a specific server but works on another

When encountering issues with the Extractor SDK on different servers, consider the following recommendations:

• Ensure all required files are in place: Your .NET application should contain all the files located in the /Redistributable/netVersion/ directory.

• Execute VBScript sample script: If the full version installer for the Extractor SDK has been run on your server, download, unpack, and execute this VBScript sample script: PDF Extractor SDK - PDF OCR To Text. If this sample fails, a full version reinstall of the SDK may be necessary.

• If the previous test fails, Try an isolated .NET sample: Compile and run an isolated .NET sample with C#, then copy it onto the server's Desktop and run it from the command line: PDF Extractor SDK. If this step fails, some required files might be missing on this server.

• Check for necessary runtime files: Confirm the presence of necessary runtime files on the server: .NET Framework 4.5 or .NET Framework 4.7 and Microsoft C++ Runtime (required for OCR in PDF Extractor). Choose the x86 or x64 version, or install both.

• Test standalone compiled C# sample: If the standalone compiled C# sample functions, but your app does not, try running this isolated .NET web application: ASP.NET sample for Scanned PDF to CSV.

Consider additional actions for ASP.NET issues: If the isolated ASP.NET C# compiled application does not function, consider implementing the following solutions:

1. Please adjust the IIS Application Pool for your app to use .NET 4.7.2 (a restart may be necessary).
2. Make sure that your IIS is configured correctly to host .NET applications. The problem could be due to a misconfiguration. You can refer to the official Microsoft guide on how to host ASP.NET apps on IIS for assistance.
3. Verify that your web app has the required permissions to access and execute the DLL files from the ByteScout SDKs.
4. Consider running the app under a different user account in the IIS Application Pool. Sometimes, issues can occur due to permissions or restrictions associated with the user account.
5. Check if your IIS worker process (w3wp.exe) has sufficient allocated memory. Insufficient memory could lead to app failures.
6. Take a look at any server security software or firewall settings. These settings might be blocking certain operations of the SDK, causing potential issues.