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Ubuntu system ECS cannot remotely and cannot connect to the database after using the script "how to restrict external scanning behavior through firewall policies"

Ubuntu system ECS uses the script in "how to restrict external scanning behavior through Firewall Policy" for security protection. The phenomenon that the system cannot be remotely or the database cannot be connected is due to the fact that the script restricts external packet requests. You can repair it according to the actual port conditions you use according to the following actions:

1. Take a look at the current rules, there is no allowed entry direction of port 22.

two。 Add the ssh in the input direction, and then the test can be connected (the same is true of 3306, etc.)

Execute the command:

Ufw allow 22

3. Ping domain name prompts unkonwn host that you need to add rules for domain name resolution.

Execute command: ufw insert 1 allow out 53/udp (why is it different from the above add rules, first of all, there are rules in the out chain, and this allowed rule needs to be added at the top, so using insert 1 means adding before the first one, and the latter means udp protocol that allows port 53 to leave the direction).

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