Merge pull request #1740 from syncfusion-content/259599-ug

259599-ug: Update more information about IIS OCR ( net 8.0) troubleshooting details

Author: chinnumuniyappan

Document-Processing/PDF/PDF-Library/NET/Working-with-OCR/Troubleshooting.md

@@ -491,6 +491,39 @@ NuGet:  <a href="https://www.nuget.org/packages/SkiaSharp.NativeAssets.Linux.NoD
 </tr>
 </table>
 
+## IIS Fails to Load Tesseract OCR DLLs
+<table>
+<th style="font-size:14px" width="100px">Exception</th>
+<th style="font-size:14px">The application failed to load Tesseract OCR DLLs when hosted on IIS, resulting in the error:
+Could not find a part of the path 'C:\inetpub\wwwroot\VizarCore\x64'.</th>
+<tr>
+<th style="font-size:14px" width="100px">Reason
+</th>
+<td> * IIS couldn't load the required Tesseract and Leptonica DLLs because some system components were missing.<br>
+* The Visual C++ Redistributables for VS2015-VS2022 (x86 and x64) were not installed.<br>
+* IIS on a 64-bit server needs both redistributables to load native libraries correctly.<br>
+* The application's folder paths and permissions were not properly set up for OCR binaries.<br>
+</td>
+</tr>
+<tr>
+<th style="font-size:14px" width="100px">Solution</th>
+<td>
+<b>Installed Required Redistributables</b><br>
+Installed both <b>VC_redist.x86</b> and <b>VC_redist.x64</b> for VS2015-VS2022 on the IIS server.<br>
+<b>Updated Server</b><br>
+Applied all available Windows updates (including cumulative and Defender updates) to ensure system stability.<br>
+<b>Configured Application Paths</b><br>
+Set default paths for OCR binaries:<br>
+* C:\inetpub\wwwroot\myapp\Tesseractbinaries<br>
+* C:\inetpub\wwwroot\myapp\tessdata<br>
+<b>Set Proper Permissions</b><br>
+Ensured IIS_IUSRS group has <b>Read & Execute</b> and <b>List folder contents</b> permissions on the above directories.<br>
+<b>Observed Delayed Activation</b><br>
+OCR functionality did not activate immediately-likely due to IIS caching or delayed DLL loading-but began working shortly after configuration.<br>
+</td>
+</tr>
+</table>
+
 ## OCR not working on Azure App Service Linux Docker Container: Exception has been thrown by the target of an invocation
 <table>
 <th style="font-size:14px" width="100px">Exception</th>