Can't connect - Error 2002

[Apoema]

Well I had gave up on SE support on this, so sorry for not replying Einmimiria. There goes my planned update:

I ended up changing the whole modem/router configuration in my house just so I can bring the Ethernet cable to my living room and connect to my gaming pc. It's a far from ideal solution and I would really appreciate any ideas so I can keep cable clutter away from my living room but it works.

So yes I can connect to the game using the Ethernet cable. I also tested that I can connect to the game using the WiFi in my primary computer (which is now running on the WiFi). This really throw away my WiFi network as the root of the problem theory, since my primary computer don't even have any port forwarding configuration set for it.

This post and Einmimiria reply made me think that maybe there is some incompatibility between my wifi card and FFXIV? I never thought something like that would be possible but my pc has an integrated wifi card, I do have a usb adapter available I will try using that...

[Apoema]

Ok, real, final solution!

Going to Device Manager > Network Adapters > Intel Dual Band > (Right Click) Properties > Advanced Tab, and setting "802.11a/b/g Wireless Mode" to 2.4Ghz 802.11b/g solves the problem!

Looks like the problem was on the 5Ghz WiFi network and that is why changing the WiFi adapter helped and probably why I never had problem outside of this PC (since my other computer always use the 2.4Ghz band anyway).

The remaining question now is why FFXIV took problem with my 5Ghz WiFi, it is true that Google Wifi has a exotic standard that merge the two bands in the one Wifi Network and that might have helped but I still have no idea why should this matter to FFXIV.