Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
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|Forwarding web requests to different web servers||15||147|
|BGP routing on Windows 2016||7||92|
|looking for a program or router to monitor internet connection||4||69|
|Cannot connect to airport express/internet with Windows 7 PCs, though, Vista PCs are connected to network||28||50|