Connection refused, but port is open

Question

My Idea was to make netcat-Connection between two devices in different LAN; Now I looked in settings of WiFi-Router and created a port forwarding; port 4004 of router should now be able to connect me to the port 9009 on my device; on that device I started nc -l -p 9009 to open the port for listening;
Now from extern I try to connect: nc <router-ip> 4004
All I get, is connection refused -_-

PS: trying on canyouseeme.org told me the port is open ¯_(シ)_/¯

gXLg · Accepted Answer

After that long time I came back and saw my question. Well. It was because of "Hairpin". It is sometimes not allowed by the router. That means I can't connect to the router from it's external address being in the LAN from the router. Back then I did not think there could be a difference of being in the same network.
For me, VPN solved it.

Connection refused, but port is open

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