How to properly set firewall on Ubuntu server?

[krave]

I have a Ubuntu 22.04.1 LTS server provided by vultr.
I have set up a network to connect with in OpenVPN Cloud with the Ubuntu server set as a connector.

After some trials, I found that I can only access public internet websites when the firewall on the connector is disabled.

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ufw disable

I have tried to allow http and https by ufw:

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ufw allow http

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ufw allow https

But that just can't work.

Now my firewall rules look like:

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Status: active

To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       Anywhere
80/tcp                     ALLOW       Anywhere
443                        ALLOW       Anywhere
1194                       ALLOW       Anywhere
22/tcp (v6)                ALLOW       Anywhere (v6)
80/tcp (v6)                ALLOW       Anywhere (v6)
443 (v6)                   ALLOW       Anywhere (v6)
1194 (v6)                  ALLOW       Anywhere (v6)

How can I have both firewall enabled and Internet Access available?

By the way, when ufw enabled, I am able to ping google etc. But websites filed to be opened. All browsers refused to work.