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What should I do if the certification of Sinopec's remote training system fails?
1. First of all, if you are not in the company intranet, you should log in to the intranet, that is, VPN. (Red A appears)

2. Then enter the correct URL and click "China Petrochemical Root Certificate Import Tool" under the login interface to ensure that your browser has a certificate.

Finally, make sure that your browser's IE kernel version is not too low.