SSL Validate Cert script not working

I noticed that the below script is not working because I none of my logs have this entry and I suspect it’s because my bro server is being blocked upstream somehow. I checked and it is being loaded.

Does anyone know what ports my server needs through the firewall for this to work?

https://www.bro.org/sphinx/scripts/policy/protocols/ssl/validate-certs.bro.html

Thanks.