I had the login problem two months back when osu! was getting constant updates, one day my account just went disconnected, and when i tried to login, "Connection Failed, retrying in 30 seconds" I get that every time.
Note:
-I was able to update
I did the following before,
-Run as Administrator
-Logout and Login again
-Uninstall and reinstall latest ver.
I used to play osu! daily because i love it so much since i started playing last year, but I thought the server was under constant maintenance that i put off osu! for like months now, i'd really like to be back on track.