The lol security certificate has expired or has not taken effect, which means that the security certificate has expired or has not been used yet.

A security certificate is a kind of identity authentication, or a private key. The security certificate is unique and different from anyone else's certificate. The security certificate is encrypted by the top international certification authority (referred to as CA). The key length varies from 40 to 256 bits, which is called encryption strength. The larger the key length, the harder it is to crack and the more secure it is.

Solution:

First method:

1. Open the "Date and Time" => "Change Time and Date Settings" tab => Set the correct time and date, as shown below:

2. Select the "Time Zone" tab => Set the time zone to "UTC+08:00" => Confirm and enter the game again. As shown below:

The second method:

1. First, when encountering this kind of problem, exit the game;

2. Go to IE To set security options, first open the IE browser, click the Tools menu, and select Internet Options;

3. In the Internet Options, select the Advanced tab;

4. In the Advanced tab Find the security options, find the two options as shown in the picture, and uncheck them. And save the settings and exit IE.

5. Then run LOL again, and this problem should disappear.