Constant issues logging in

[Darkmatter]

I'm having the same issue too, even after the recent maintenance that i hoped would fix things. Constant 90002/90001/10105 errors when logging into characters; regularly receiving 2002 error while connecting to different datacenters.
Also playing through steam if theres any connection there

I've also tried all of the following:

Open the control panel of the PC and go to ‘Network and Internet’. Once there select ‘Internet Options’
- 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 now. Once your PC has been restarted, Right-Click the FFXIV launcher icon once more and select "Run as Administrator"
*Make sure your fire wall or antivirus program is not interfering with the game
- Flush DNS: Within the "Command Prompt" of the device, please type the command "ipconfig /flushdns".
- Reset TCP/IP: Also within the Command Prompt, type the command "netsh int ip reset" and then restart the computer.
- Delete the Patch Folder: Navigate to the folder using this path This PC > Docs > My Games> FFXIV ARR > Downloads > FFXIV patch (Use for either the version update error or cannot download patch files error)
Then either rename or remove the folder, the next time FINAL FANTASY XIV is launched, the client will repair the folder.
- Change local DNS: Please try changing the local DNS server to 8.8.8.8 and 8.8.4.4
- Power cycle the console and router by shutting down the PlayStation 4/Router and leaving the power supply unplugged for 5-10 minutes.

Lastly, check to see if the following port ranges are opened on your router. You can contact your ISP and request for assistance with opening the ports.

▼TCP
54992 through 54994,
55006 through 55007,
55021 through 55040

in addition, I've:
updated all graphics drivers
updated to the latest windows update
renewed my IP address and flushed DNS
changed my preferred DNS server to 8.8.8.8
added exception rules to my firewall and security software
completed a full network reset
deleted the contents at documents/mygames/ffxivarr

The issue persists throughout the day, it doesn't matter if I'm playing in the morning or during peak hours.
I have been playing FFXIV for 5+ years without issue and it only started occurring in the last week with no obvious changes on my end and no connection issues to any other games/services.

[Raven76]

My wife too has been playing since ARR and encounters these issues, its sad that technical support seems focussed on blaming the issues on the user, not to mention not reading the actual issue and constantly giving me widows directions when I am not playing on a windows machine