Right but I said trolling or was coincidence. Meaning you're probably on the side of Coincidence...
I tried logging in from 2 PHYSICALLY different location, as well as from multiple IPs, as well as rebooting routers, computers, and switches. Nothing.
Until I submitted a ticket to SE and about 10mins later I was able to get in.
This is a problem on SE's end - they've even acknowledged login difficulties on the lodestone. They are aware and I'm sure they are doing what they can to fix it asap. You'll probably see a post go up soon in the next few hours saying the issue has been resolved after they go through every character....
Once the game has crashed or has quit, the servers can't communicate with your IP address anymore.... as it uses a specific port and is more than likely a client-initiated connection... meaning the server does nothing until it hears from the client, which means it's not hearing from the client for a really long time, but also isn't disconnecting the account properly.
Chances also are that half the people in this thread are only renewing their IP from the local router and claiming it worked.
Quick reboots usually never fully reset your connection... Especially since almost everything out there has a time-out period in which things will just auto-reconnect with no issues. Doubt you'll get a new IP from your ISP that fast either. Leases usually last an average of 8 hours from an ISP, so you'd have to be offline for a maximum of 8hours otherwise be down during the window when the lease expires and the DHCP server hands that IP to someone else. Only way you're gonna get a new IP faster is if you do a release/renew on the router itself, which in most cases ISPs deny access to the release and the router ends up releasing it only from itself, not the DHCP server... which in turn results in the same IP address.
Once again, pretty sure anyone who may have seen this as a fix is just caught up in a coincidence. It would not make any sense from a technical standpoint for this to work with this type of error.
Anyway I'm done caring. I'm online so I'm going back to playing.