Good morning and thank you for posting on the Final Fantasy XIV Technical Support Forums.

Is this message instantaneous when you log in, or does the download start and then fail?

Here are a couple things to try:

Try resetting the router by turning it off, then on again.

Try a clean boot. Click Start, type msconfig.exe in the Start Search box, and then press Enter to start the System Configuration utility. On the General tab, click the Selective startup option, and then click to clear the Load startup items check box. On the Services tab, click to select the Hide all Microsoft services check box, and then click Disable all.

Open the IE browser, open the "Tools", go to "Internet Options" and adjust the following settings:
- 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, please move the slider to the lowest possible settings or to "Allow All 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"
- Go to the "Compatibility" tab, and change the compatibility mode to "Windows 7"
- 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"

Check the following Port Ranges on your router/modem to ensure that the following Port Ranges have been opened/forwarded/triggered:
▼TCP
54992 through 54994,
55006 through 55007,
55021 through 55040

Your ISP may forward these ports for you.*

If the problem cam up after you changed those settings, it may be worth trying to change them back.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!