I have hosted a website on my computer and have verified that it is accessible internally. I am using a Prima Tel Router and have set up forwarding for exposing the website publicly (Snapshot of the configuration here)
Open Port Check Tool says that the port is open but accessing the website publicly results in timeout. (I tried forwarding other ports including ssh but everything times out)
Note that I have had the same setup working with a different ISP and Router but I have had shift base recently and port forwarding is not working any longer. If it helps, I am using archlinux and nginx, and firewall is disabled. Seems to me like a configuration issue with the router but I'm clueless as to what to try next.