Some ports need to be open for RPGM to work from outside. This includes the 80 port for HTTP but also the port 443 for HTTPS if you want RPGM Server to serve on HTTPS directly.
- Go to the Firewall with advanced security.
- Right click on Inbound Rules on the right panel and select New Rule....
- Select Port and click Next.
- Select TCP and enter
443for HTTPS or
80, 443for both.
- Select Allow the connection then Next.
- Ports are now opened!