I am selfhosting a little photo website (local network IP is 192.168.1.100) but encountered a problem while trying to access it from outside of my home network (public IP). I have tried the NAT Forwarding -> Virtual Servers approach, as shown in the picture below:

As well as setting up dynamic DNS with no-ip and enabling the openvpn server with no results...

Furthermore the openVPN client I use keeps showing the message: "Server poll timeout, trying next remote entry..."

Any atempt to access through a web browser using <public IP>:80 or <public IP>:5000 shows the message: "The connection has timed out"

I have confirmed that the internal IP and ports work within the local network and I had a very awkward call with my ISP's customer service because I thought they were blocking all incoming ports, which they confirmed are open...

I am very frustrated and would appreciate pointers on how to solve this. So far I have not seen firmware updates and confirmed the time and date settings are correct. Happy to provide any other information if someone could tell me where to find it.