VPN
Networking
Separate VPN connectivity from application access
A connected tunnel is one check; DNS, routing and the destination service are separate checks.
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Networking
Tunnels
Document the target before forwarding a port
Check the local listener, protocol and destination before exposing an application through a tunnel.
IP Tunneling
Networking
What is CGNAT, and Why Can't I Port Forward on My Own Router?
You've opened the port, checked it twice, and it still doesn't work. Here's why — and it usually isn't your router's fault.