*update*

- make a new char in ultros server (NA) and i still get 90002 error
- make another char in garuda server (same jp region but different servee) also getting 90002 error
- use vpn mudfish, still getting 90002 error (mudfish set to elemental server, node setting = auto)
- turn off firewall, still 90002 error
- delete ff14 and fresh install, still 90002 error
- format my pc and fresh install (again) ff14, 90002 error
- internet explorer setting according to mod suggestion, still 90002 error

All of that with testing with other online game (i use wow, bdo, secret world, even counter strike, all in 2 hours play more or less) and NONE of it give me anything close to network problem, not even a lag spike.

The only thing i havent try yet is...
1. bring my friend laptop/pc with ff14 installed and try playing from his laptop/pc using my current isp
2. change my isp

If method 2 still get me 90002 error, then the problem is from you SE period full stop

I'll post again in a week