Database issues and pitfalls in connecting to cloud servers with Navicat Premium15

When using a cloud server, we sometimes connect to the database, but when using Navicat Premium15 to connect, we always get an error.
The following is a general connection method using MySQL 5.6.50 in Tencent Cloud Server.

General Links:

After filling in the above, click Test Connection, and an error will be reported, as shown in the figure:

Unable to connect! In this case, when modifying the security group rules in Tencent Cloud Server, both the inbound and outbound rules need to be changed.

After clicking Finish, adjust the outbound rules. This is the same as the inbound rules and will not be explained here.
After completing the above operations, return to Navicat Premium15 for configuration, and still get an error (2003-Can't connect to MySQL server on 'host' (10060 "Unknown error"))
Return to the home page of the pagoda and click on the security configuration on the home page.

Click Release. After release, return to Nacivat Premium15 and click Test Connection. It will show that the connection is successful.

The above are the problems I encountered during the connection test. I share them with you for discussion. If there are any problems, please correct them in time. Thank you.

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