Error 90000 after instance boss defeated

I was able to defeat Garuda with a duty finder party, and I have the experience from that fight in my progress bar. I was watching the cutscene immediately after the fight and got error 90000 - connection with the server was lost. I'm hoping that someone can look at my account and verify that I defeated the boss, as I really don't want to fight her again (it was hard!). I was unable to log in again until I restarted the client, at which point it was as if the duty was never started. Any response would be appreciated.

Unless you can progress I guess you have to fight her again.