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When I try to connect to my simple winsock server using my localhost/LAN IP, the connection is established with no problems.

However, if I attempt to do so using my external IP, I keep getting timeouts. Other tools, such as canyouseeme.org and ping also return timeout.

Port forwarding and disabling the firewall didn't change anything.

I've already asked this question on stack overflow and I was told to move it here. That is, to link it here. Visit the above link to the full question, please.

Jason
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  • What kind of router/firewall do you have, and can you post the configuration? – Ron Trunk Feb 06 '19 at 18:00
  • Where are you connecting from, when you attempt to use this external IP? Are you connecting from a host outside your network? If you are attempting to connect from inside this would likely be a hairpin nat problem. – Zoredache Feb 06 '19 at 18:01
  • @RonTrunk My firewall is just default Windows firewall. My router is Orange Livebox 2.0 (you probably don't know it, as my ISP isn't an international company). That's screenshot of the router's configuration page. I translated all the words into English, so you should be able to understand. – Jason Feb 06 '19 at 18:21
  • @Zoredache I'm connecting from my own computer, i.e. host inside my network. I haven't tried to connect from outside of it, yet (beyond the canyouseeme.org website). – Jason Feb 06 '19 at 18:28
  • Well, like I said, hairpin NAT problems. If you are connecting from internal to internal, that is probably not going to work. Search the terms 'hairpin nat'. One answer from here. https://serverfault.com/questions/55611/loopback-to-forwarded-public-ip-address-from-local-network-hairpin-nat – Zoredache Feb 06 '19 at 18:31
  • @Zoredache If I understand correctly, assuming that was the hairpin NAT problem, then canyouseeme.org should connect properly, while it actually timeouts. – Jason Feb 06 '19 at 18:58

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