What browser does China Social Security Network use to log in?

With ie browser, the version can't be too high. Sometimes the system gets stuck. This is normal. Usually, the card will be stuck when the traffic volume is relatively large. You have to log out and log in again, and don't operate the conference card for a long time, mainly to limit the number of online people.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.