The issue you are describing is most associated with interference with the game data. Most of the time, it results from certain security/privacy changes on Internet Explorer. Other times, it occurs when an application running in the background causes interference, such as anti-virus software, firewalls, media players, web browsers, communications software, etc.
Please make sure all background applications (including anti-virus programs such as Norton, Kaspersky, Windows Defender, etc.) have been disabled and/or closed to minimize game interference before attempting to log in.
Ensure that the latest version of Internet Explorer is installed on your PC (even if you don’t use Internet Explorer). Please do not use Microsoft Edge for these steps, as that is a different Internet platform.
Once Internet Explorer is up-to-date, please open the Internet Explorer browser’s “Internet Options” by clicking on the “Tools” option (or type Alt+X), then click on the “Internet options” setting. Please adjust the following settings:
- Under the General tab, please delete ALL browsing history by clicking on the “Delete…” button, then selecting all of the options and clicking “Delete” again.
- Under the Security tab, please move the slider to the lowest possible setting, or no higher than “Medium.”
- Under the Privacy tab, look for the Settings section and click on “Advanced,” then Accept First-party Cookies and Third-party Cookies, then check the box that says, “Always allow session cookies” and click OK.
- Under the Advanced tab, look for the Settings section and scroll towards the bottom of the list and check on the setting under Security for “Allow software to run or install even if the signature is invalid.”
- Under the same section, make sure that all ‘Use TLS’ options (EXCEPT SSL 3.0) are checked. [Use SSL 3.0 should be unchecked]
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.” This option can also be set permanently by Right-Clicking on the FFXIV launcher icon, selecting Properties, then under the Compatibility tab, check the box that says “Run this program as an administrator” and clicking OK.