The Test-NetConnection cmdlet displays diagnostic information for a connection. It supports ping test, TCP test, route tracing, and route selection diagnostics. Depending on the input parameters, the output can include the DNS lookup results, a list of IP interfaces, IPsec rules, route/source address selection results, and/or confirmation of connection establishment.

Testing if ports are open on a VPN host - Powered by If you cannot connect to a VPN host server you can use Telnet to test if the ports are mapped through to the server and the server is listening. To start a Telnet session: Open a Dos window and type Telnet Open a connection to the host server by typing open my.vpnhost.com 809 (where my.vpnhost.com is the server name and 809 is the port number GRC | Shields UP! -- Internet Connection Security Analysis Sep 21, 2004 Blocked Port 1935 Troubleshooting – ProctorU

Open Port Check Tool -- Verify Port Forwarding on Your Router

Detects open TCP ports, running services (including their versions) and does OS fingerprinting on a target IP address or hostname. The scanner allows you to easily map the network perimeter of a company, check firewall rules and verify if your services are reachable from the Internet. Based on Nmap Online, it performs accurate port discovery and service detection.

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Open Port Checker & Scanner | Test Port Forwarding