Main Passwordstate Website
By default, the Passwordstate website is installed with port 443, which is the standard port used for HTTPS traffic.
You should allow any incoming HTTPS traffic on port 443 into your Passwordstate web server, unless otherwise modified.
Passwordstate also uses a Microsoft SQL database to store all of its information, and the default port for this is 1433. If you host your database on a separate server to your Passwordstate install, then you should ensure this port is accessible from your Passwordstate web server.