What should I do if I use IE8.0 to upload files in the "Corporate Finance Office" column of China Industrial and Commercial Bank's corporate network and encounter "40400 certificate signature failure"? This problem is encountered when using IE8.0 browser to transfer money in batch in corporate finance room through corporate online banking. Please check whether the previous instructions have been submitted successfully. If it is not successful, please click IE Browser-Tools-Internet Options-Security-User-defined level, and change the local directory path included when uploading the file to the server to Enabled, then the problem can be solved.