Problem when uploading files to server

Hi, everyone.

CKFinder doing well in my localhost, but when i release my website to a remote server, i have a upload problem. The server administrator told me definitively that the upload folder have write permissions, and my basedir is set correctly because the files in the file browser is right.

Here is my BaseDir and BaseUrl setting:

BaseUrl = "~/ckfinder/userfiles/";
BaseDir = "E:\\web_old\\shengmingxueyuan\\Clst Web\\ckfinder\\userfiles\\";