![websocket - How can I connect client tcp ports behind router or firewall without NAT - Stack Overflow websocket - How can I connect client tcp ports behind router or firewall without NAT - Stack Overflow](https://i.stack.imgur.com/Hvw9q.png)
websocket - How can I connect client tcp ports behind router or firewall without NAT - Stack Overflow
![Linksys Official Support - Establishing a client-to-gateway IPSec tunnel with Shrew Soft VPN client behind a router or NAT firewall Linksys Official Support - Establishing a client-to-gateway IPSec tunnel with Shrew Soft VPN client behind a router or NAT firewall](https://s3.amazonaws.com/downloads.linksys.com/support/assets/image/316761/sf316761-001_en_v1.png)
Linksys Official Support - Establishing a client-to-gateway IPSec tunnel with Shrew Soft VPN client behind a router or NAT firewall
![cisco - Let connections go through a server to a router in packet tracer - Network Engineering Stack Exchange cisco - Let connections go through a server to a router in packet tracer - Network Engineering Stack Exchange](https://i.stack.imgur.com/xGMzC.png)
cisco - Let connections go through a server to a router in packet tracer - Network Engineering Stack Exchange
![Web Server behind firewall - Network Protection: Firewall, NAT, QoS, & IPS - UTM Firewall - Sophos Community Web Server behind firewall - Network Protection: Firewall, NAT, QoS, & IPS - UTM Firewall - Sophos Community](http://farm4.static.flickr.com/3173/2738865117_9595f5cf90_o.jpg)
Web Server behind firewall - Network Protection: Firewall, NAT, QoS, & IPS - UTM Firewall - Sophos Community
![networking - Can't connect to server over local network but works fine from the Internet - Super User networking - Can't connect to server over local network but works fine from the Internet - Super User](https://i.stack.imgur.com/Eqkrc.png)
networking - Can't connect to server over local network but works fine from the Internet - Super User
![System architecture. (1) Server; (2) Internet connection; (3) Router;... | Download Scientific Diagram System architecture. (1) Server; (2) Internet connection; (3) Router;... | Download Scientific Diagram](https://www.researchgate.net/publication/224371050/figure/fig1/AS:669995159805974@1536750702732/System-architecture-1-Server-2-Internet-connection-3-Router-4-Phone-Line-5.jpg)