FCKEditor file upload - not working on production server - "Invalid File"

I have FCKEditor (2.6.4) running on my development machine with an aspx connector for file uploads (this is the asp.net site), but I can't figure out how to get it to work on a production machine. Arrgh. Spent 4 hours on this and did not go anywhere.

This appears to be a permissions issue, but:

• I have double and triple checked that IUSR and ASPNET and Network Service (and even "Everyone", for now) have permission to write files to the "userfiles" folder, which is the target for the download.
• I followed the letter of the law while setting up fckconfig.js

Symptoms:

• The editor works great. User can enter text, etc.
• The user can click the insert image button, which displays the image selection. It is possible to insert an image that already exists on the server, just fine.
• You can go to the file upload dialog and successfully create a new folder on the server through the fckeditor interface.
• But whenever a user tries to download a small and valid .png, .jpg, .gif, any image (which works fine on my localhost here) Firefox gives me an "Invalid File" message. (I've tried with numerous valid image files of different sizes and formats. Nothing works. The image is not uploaded to the server.)

relevant code from fckconfig.js:

`var _FileBrowserLanguage = 'aspx';
var _QuickUploadLanguage = 'aspx';

// Don't care about the next two lines. It just calculates the correct connector // extension to use in the default file browser (Perl uses "cgi"). var _FileBrowserExtension = _FileBrowserLanguage == 'perl'? 'cgi': _FileBrowserLanguage; var _QuickUploadExtension = _QuickUploadLanguage == 'perl'? 'cgi': _QuickUploadLanguage; `

code from fckeditor \ editor \ filemanager \ connector \ aspx \ config.ascx:

`UserFilesPath =" ~ / userfiles / ";

    // The connector tries to resolve the above UserFilesPath automatically.
    // Use the following setting it you prefer to explicitely specify the
    // absolute path. Examples: 'C:\\MySite\\userfiles\\' or '/root/mysite/userfiles/'.
    // Attention: The above 'UserFilesPath' URL must point to the same directory.

    string ap = HttpContext.Current.Server.MapPath("~/userfiles/");
    UserFilesAbsolutePath = ap;


    //UserFilesAbsolutePath = "C:\\inetpub\\wwwroot\\hot-bigoven\\userfiles\\";
    //UserFilesAbsolutePath = "C:\\inetpub\\wwwroot\\bigovenwebapp\\bigovenwebapp\\userfiles\\";


    // Due to security issues with Apache modules, it is recommended to leave the
    // following setting enabled.

    //ForceSingleExtension = true;

    // Allowed Resource Types
    AllowedTypes = new string[] { "File", "Image", "Flash", "Media" };

    // For security, HTML is allowed in the first Kb of data for files having the
    // following extensions only.
    HtmlExtensions = new string[] { "html", "htm", "xml", "xsd", "txt", "js" };

    TypeConfig[ "File" ].AllowedExtensions          = new string[] { "7z", "aiff", "asf", "avi", "bmp", "csv", "doc", "fla", "flv", "gif", "gz", "gzip", "jpeg", "jpg", "mid", "mov", "mp3", "mp4", "mpc", "mpeg", "mpg", "ods", "odt", "pdf", "png", "ppt", "pxd", "qt", "ram", "rar", "rm", "rmi", "rmvb", "rtf", "sdc", "sitd", "swf", "sxc", "sxw", "tar", "tgz", "tif", "tiff", "txt", "vsd", "wav", "wma", "wmv", "xls", "xml", "zip" };
    TypeConfig[ "File" ].DeniedExtensions           = new string[] { };
    TypeConfig[ "File" ].FilesPath                  = "%UserFilesPath%file/";
    TypeConfig[ "File" ].FilesAbsolutePath          = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%file/" );
    TypeConfig[ "File" ].QuickUploadPath            = "%UserFilesPath%";
    TypeConfig[ "File" ].QuickUploadAbsolutePath    = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%" );

    TypeConfig[ "Image" ].AllowedExtensions         = new string[] { "bmp", "gif", "jpeg", "jpg", "png" };
    TypeConfig[ "Image" ].DeniedExtensions          = new string[] { };
    TypeConfig[ "Image" ].FilesPath                 = "%UserFilesPath%image/";
    TypeConfig[ "Image" ].FilesAbsolutePath         = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%image/" );
    TypeConfig[ "Image" ].QuickUploadPath           = "%UserFilesPath%";
    TypeConfig[ "Image" ].QuickUploadAbsolutePath   = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%" );

    TypeConfig[ "Flash" ].AllowedExtensions         = new string[] { "swf", "flv" };
    TypeConfig[ "Flash" ].DeniedExtensions          = new string[] { };
    TypeConfig[ "Flash" ].FilesPath                 = "%UserFilesPath%flash/";
    TypeConfig[ "Flash" ].FilesAbsolutePath         = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%flash/" );
    TypeConfig[ "Flash" ].QuickUploadPath           = "%UserFilesPath%";
    TypeConfig[ "Flash" ].QuickUploadAbsolutePath   = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%" );

    TypeConfig[ "Media" ].AllowedExtensions         = new string[] { "aiff", "asf", "avi", "bmp", "fla", "flv", "gif", "jpeg", "jpg", "mid", "mov", "mp3", "mp4", "mpc", "mpeg", "mpg", "png", "qt", "ram", "rm", "rmi", "rmvb", "swf", "tif", "tiff", "wav", "wma", "wmv" };
    TypeConfig[ "Media" ].DeniedExtensions          = new string[] { };
    TypeConfig[ "Media" ].FilesPath                 = "%UserFilesPath%media/";
    TypeConfig[ "Media" ].FilesAbsolutePath         = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%media/" );
    TypeConfig[ "Media" ].QuickUploadPath           = "%UserFilesPath%";
    TypeConfig[ "Media" ].QuickUploadAbsolutePath   = ( UserFilesAbsolutePath == "" ? "" : "%UserFilesAbsolutePath%" );

      

        
        
        
      

    

`