"The underlying connection was closed: An unexpected error occurred on a receive."

[Ikira]

I've been trying to launch fiesta for the first time (I've never played before) and I received the same error. I tried launching from the file in the "C:" drive, restarting my computer, and fiddling with my firewall.. nothing worked. -_-

**Edit: I just tried closing and reopening the launcher as you did and the patch was completed, but when I log in I still get the same error only it shows up in a message box as error "503". If there is a real solution to this issue and you find it, would you mind posting it here?

~Ikira