I think this error is (30002) is internet issue you having packet lost it may be due to your ISP. You most wait for the servers/core system to be fix what happen is your ISP is losing to many packet and the Servers D/c you. So try and open your ports. If it's not a internet issue then i don't know what you could be having.

UDP - 55296 - 55551
TCP - 54992 - 55551
UDP - 443


and by some reason you don't feel like opening ports because you feel players should not fix issue that should be fix by SE. Then you going to have this issue to you try and see if that fix it for you.

If that does not work then it your ISP losing to many packet from the servers and you most wait for the Servers fix / Core system. So there no need to spam the forums for this issue they known about it for over 1year. There noting they can do to they fix the servers issue.

All it going to happen is you going to get ban from the forums which then mean you get ban from FFXIV for spamming the forums. If your FFXI account is also link to the same account you using to talk on here then guess what both your ffxi and ffxiv would be ban for you spamming the forums.

There noting sadly we can do about it and the GM going to say the same thing about this issue. You most wait like everyone else who getting this issue due to there ISP losing to many pocket lost and the servers D/c you.

Also try and delete and redownload FFXIV maybe that also fix your issue if the port did noting for you. If anything then you most wait for the servers to be fixed. Also if you using wireless you should plug your computer in and see if that fix your issue. If there people downloading and using the internet at your house a lot then this could also get you a d/c from the game.

Trying to help you out here try this

Opening ports
If wireless use cable
And re-download ffxiv