Server Disconnecting Clients - Wireshark Proof - Server sending FIN TCP flag- BUG

[Moronica]

That really sounds like a problem on Square Enix’s end, or at least with the data center they’re using.

Do you still have a Wireshark capture from a disconnect? I’d really be interested in the TTL values. If the TTL of the FIN packet is identical to the packets received before, the FIN most likely came from the server itself. But if e.g. the TTL of the FIN packet is greater by 1, it may have come from the node directly before the server (assuming both use the same TTL for packets they create).

The fact that the connection is closed by a FIN instead of aborted by a RST also points more to a problem in the data center IMO than to a problem with your router or anything else on your end.

From the data center’s point of view, both your and your wife's PCs are indistinguishable, because they both use the same public IPv4 address (which you get from your ISP). Maybe the data center’s DDoS attack detection is “misinterpreting” multiple TCP connections to your IP address as some sort of “attack” and kills one of them? But you get the disconnects also if you’re trying to play without your wife, right? (I’d also expect to see a RST in such a case instead of a FIN, or the data center’s firewall simply swallowing packets silently without any reply at all.)

[DoomAngel]

All TTL values from the FFXIV server (204.2.229.93) are the same at 54, after reviewing the wireshark data, including the FIN, followed by RST.

[DoomAngel]

Ok, so I created another character on a different Data Center, where the IP Address of the FFXIV server is different and I have had no disconnects yet. IP of new server is 195.82.50.49 Granted, the disconnects happened most frequently in Dungeons, Raids, etc, and my character is only lv 12 and hasn't opened any dungeons yet... so we'll see. But so far... few hours of letting the game sit idle, and some basic questing, so far no disconnects.

Moronica and Packetdancer, you guys are amazing! ...freaking geniuses... Even though the issue isn't resolved yet, I've gotten more help from you two in the last few days, than Sq Enix in months! They just keep closing my tickets stating it's a my PC, Router, packet loss, etc, and that they cant help me. At least now I feel like it's getting narrowed down! If there's any other data you need that's not too sensitive to post here, or any specific wireshark data that'll help, let me know.