[RSS Feed/News] If using Google OAuth for sending activation emails, which port must be enabled on a Linux server?

[XenForo]

I am using strict ufw whitelist rules on my VPS in HK:

Code:

root@cs-cn:/users/supervisior# ufw status
Status: active
Logging: on (low)
Default: deny (incoming), deny (outgoing), disabled (routed)
New profiles: skip

To                         Action      From
--                         ------      ----
???/tcp                    ALLOW       Anywhere                   # SSH
???/tcp                    ALLOW       Anywhere                   # AAPanel (Bao-Ta)
???/tcp...

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