TCP RST packets from server-side when connecting from AT&T, not Verizon

[Dynratygus]

Good afternoon and thank you for posting in the Final Fantasy XIV Technical Support Forums

Were any updates or changes made to the network settings at all? Additionally were you able to connect directly to the router?

Thank you for posting in the Final Fantasy XIV Technical Support Forums

[plasmacutter]

No changes to network for about a year.
What had been rock solid for 18 months suddenly went south on patch day.

I'm now disconnected via RST 2-4 times an hour (no lag or freeze.. i've been booted as I take damage in a normal dungeon)

I have since grabbed several more instances of this happening, including a full session pcap from login to RST disconnect if required for diagnostic work.

Latest example running absolutely nothing but FF after applying full connectivity support boilerplate:

15972 523.534874 204.2.229.102 192.168.1.68 TCP 286 55006 → 50083 [PSH, ACK] Seq=2341539 Ack=221873 Win=196736 Len=232
15973 523.541852 192.168.1.68 204.2.229.102 TCP 238 50083 → 55006 [PSH, ACK] Seq=221873 Ack=2341771 Win=262400 Len=184
15974 523.561173 204.2.229.102 192.168.1.68 TCP 190 55006 → 50083 [PSH, ACK] Seq=2341771 Ack=222057 Win=196736 Len=136
15975 523.602176 192.168.1.68 204.2.229.102 TCP 54 50083 → 55006 [ACK] Seq=222057 Ack=2341907 Win=262400 Len=0
15976 523.875019 192.168.1.68 204.2.229.102 TCP 238 50083 → 55006 [PSH, ACK] Seq=222057 Ack=2341907 Win=262400 Len=184
15977 523.896164 204.2.229.102 192.168.1.68 TCP 60 55006 → 50083 [RST] Seq=2341907 Win=0 Len=0
15978 523.900744 192.168.1.68 204.2.229.102 TCP 54 50084 → 55006 [FIN, ACK] Seq=11009 Ack=8770 Win=261376 Len=0