The best way to check if a port is blocked is to do a port scan from the client machine. There are many ways to do a port scan but since you mentioned being on Windows then I will suggest the Microsoft command line utility PortQry and the Graphical version PortQryUI. To test all open ports: portqry.exe -n #.#.#.# To test a specific port:
How can I tell if my ISP is blocking port 80? - Ars Mar 08, 2007 Check TCP Port 80 (http) with telnet - Thomas-Krenn-Wiki Thereby, simulating a browser and testing access through port 80 using the telnet command becomes simple. The following steps are necessary for this from a Linux command line: Execute telnet SERVERNAME 80. Thereby, telnet will connect to the server named SERVERNAME through port 80. Telnet Command HTTP Check Port 80 - simplescripts.de The better way to Check Port 80 (free tool) If you would like to check your Webserver at regular intervals, you can use SLCheck. SLCheck is a command line utility that connects to the Webserver and checks the answer. Batch files can be executed in dependance of the result.
Why my Windows 10 listens on port 80? | Wilders Security
CanyouSeeMe - Port Checker canyouseeme.org Canyouseeme.org is a free online tool which can be used to verify status of a port in your system. Our system goive a similar facility to test open port online. Ports are a kind of channels by which programs can communicate with external world. How to check which application is using which port
Common Problems & Fixes For Port Forwarding | PcWinTech.com™
Welcome to CheckMyPort.com | Check your ports over internet Check your common ports or specific port over internet How can I tell if my ISP is blocking port 80? - Ars Mar 08, 2007 Check TCP Port 80 (http) with telnet - Thomas-Krenn-Wiki