while ( true )
                        {
                            sFilePath = System.IO.Path.Combine( sServerDir, sFileName );

                            if ( System.IO.File.Exists( sFilePath ) )
                            {
                                iCounter++;
                                sFileName =
                                    sFileNameNoExt +
                                    "(" + iCounter + ")" +
                                    System.IO.Path.GetExtension( oFile.FileName );

                                iErrorNumber = Errors.UploadedFileRenamed;
                            }
                            else
                            {
                                oFile.SaveAs( sFilePath );

                                if ( Config.Current.SecureImageUploads && ImageTools.IsImageExtension( sExtension ) && !ImageTools.ValidateImage( sFilePath ) )
                                {
                                    System.IO.File.Delete( sFilePath );
                                    ConnectorException.Throw( Errors.UploadedCorrupt );
                                }

                                Settings.Images imagesSettings = Config.Current.Images;

                                if ( imagesSettings.MaxHeight > 0 && imagesSettings.MaxWidth > 0 )
                                {
                                    ImageTools.ResizeImage( sFilePath, sFilePath, imagesSettings.MaxWidth, imagesSettings.MaxHeight, true, imagesSettings.Quality );

                                    if ( Config.Current.CheckSizeAfterScaling && this.CurrentFolder.ResourceTypeInfo.MaxSize > 0 )
                                    {
                                        long fileSize = new System.IO.FileInfo( sFilePath ).Length;
                                        if ( fileSize > this.CurrentFolder.ResourceTypeInfo.MaxSize )
                                        {
                                            System.IO.File.Delete( sFilePath );
                                            ConnectorException.Throw( Errors.UploadedTooBig );
                                        }
                                    }
                                }

                                break;
                            }
                        }

------解决方案--------------------
修改 ckfinder\_source\Connector\CommandHandlers\FileUploadCommandHandler.cs 文件
C# code

string sExtension = System.IO.Path.GetExtension( oFile.FileName );
sExtension = sExtension.TrimStart( '.' );
sFileName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + "." + sExtension;