First, check whether your current certificate is trustworthy. If you reinstall the certificate in an untrusted state, the certificate import wizard. Put the certificate in the trusted root certification authority.
Extended data:
Every holiday, it is hard to get a train ticket, but fortunately, you can book tickets online through 12306 without queuing at the ticket booth. 12306 is convenient, but it may not open normally. Some netizens encountered such a prompt when using 12306, "This content has been blocked because it was not signed with a valid security certificate".
This tip is designed by IE to ensure that your computer is not infringed by the dangerous certificate. To cancel this warning, in addition to clicking "Show Content" under IE 10, you can install the installation certificate correctly in the following ways, which can completely solve the problem of wrong security certificate and speed up your booking. If you encounter a kind of situation when using other IE kernel browsers, you can also solve it by this method.
Tips:
Please ensure that the certificate comes from a regular website before importing, otherwise the imported certificate may pose a threat to your computer security. If you use IE 10 to purchase tickets, some functions of the page cannot be used normally. I suggest you refer to this article and add 12306.cn to the list of compatible views, so that the website of 12306 can be opened normally in compatibility mode.
Minnan Net-12306 official website prompts that "no valid security certificate signature" is blocked.