Quote Originally Posted by Purotekuta View Post
For those of you receiving Launcher Error System Error: 400 You can try a few things here. Sometimes this works, I know cause I have this error.

Open up your Command Prompt, can be found using Windows Key R to start a Run Pop Up, Type in cmd, Press Enter key on your Keyboard. Another Window Will pop up. Type in ipconfig /flushdns

Wait a good minute or two, then try the launcher again. If error happens, try typing in ipconfig /release

by typing in that last command iponfig /release you will be disconnected from everything, internet IM's, everything. Again wait another minute or two, Now Type in ipconfig /renew which will get you connected back online. Wait a good minute or two again. Try the Launcher to FF14. If Error still happens you will just have to wait until You can get the game to work and or Log In to Play. These commands will not harm your computer, they do a Temporary Fix on things. Read Carefully before typing in these commands, you don't want to be sorry later.
Your fix worked very well. Thanks for sharing.