When using Canyouseeme.org it appears that my ISP is blocking every port. I am attempting to run a web server which works fine locally. I asked a previous question (here) regarding using different ports other than 80 but they all seem to be blocked.
Is this site a valid tool for checking on the ports or could they still be usable? Also, I am using a router, as well as an ISP provided modem. Could one of these devices be causing the problem?
And the final question remains. Why would the site say those high ports are blocked but then allow me to communicate over them?
Unless someone can verify I am just going to assume they don't care about those insanely numbered ports just like an ISP.