Greetings fellow Eorzean,

I'm sorry to hear that you have been experiencing persistent 90002 errors for the past couple of months. Also, thanks for providing me with a list of troubleshooting methods that you have already tried. Here are a few things I would recommend trying, as it may help with your constant disconnects:

1. Please make sure all background applications (including anti-virus programs) have been disabled or closed to minimize game interference before attempting to log into the launcher.

2. Please adjust the following settings in 'Internet Options' in the Control Panel:
- Under the "General" tab, please delete ALL browser history.
- Under the "Security" tab, please move the slider to the lowest possible settings or no higher than "Medium"
- Under the "Privacy" tab, click “Advanced” and select ‘Accept’ under both First Party and Third Party Cookies.
- Under the "Advanced" tab, please make sure that "Allow software to run or install even if signature is invalid" is CHECKED.
- Make sure that all SSL and TLS (EXCEPT SSL 3.0) are CHECKED. [SSL 3.0 should be UNCHECKED]
- Hit "Apply" to save the settings, and then "OK, to close the Internet Options menu.
- Right-Click on the FFXIV launcher icon and select "Properties"
- Hit "Apply", then "OK" to save the changes.
- Please RESTART your PC after. Once your PC has been restarted, Right-Click the FFXIV launcher icon once more and select "Run as Administrator".

3. Lastly, check to see if the following port ranges are opened on your router. You may contact your ISP for assistance with opening these port ranges for you:
▼TCP
54992 through 54994,
55006 through 55007,
55021 through 55040

I hope these steps are helpful! Thank you for posting in the FINAL FANTASY XIV Technical Support Forums.