How to open ports for my service? (80, 88, 443 and 8443)

[vsile]

Hello! I'd like to use webhook on TLS server. I run my go-script http.ListenAndServeTLS("0.0.0.0:443", "webhook_cert.pem", "webhook_pkey.pem", nil) But I can't get access to my page.. The port is filtered.

How to open it?

sudo ufw allow 443/tcp doesn't work: permission denied