Debugging
When installing and configuring CKFinder, sometimes it may happen that for unknown reason CKFinder doesn't work as expected, for example it returns an error about insufficient permissions ("It was not possible to complete the request due to file system permission restrictions."). In such case it might be more usable to run the debug version of server connector to find out what's the problem.
web.config
To use CKFinder for ASP.NET in debug mode, add <compilation debug="false"/> to the web.config.
<system.web> <compilation debug="true" /> </system.web>
CKFinder.dll
Apart from setting compilation element, the debug version of CKFinder binaries: CKFinder.dll and CKFinder.pdb should be copied to the "bin" directory of ASP.NET application. Both files are available in the ckfinder/bin/Debug directory.
When debugging problems with file uploads, using a tool to trace HTTP connections, like Fiddler, might be helpful.
Warning: it is not recommended to run production ASP.NET applications with debug mode enabled.