Ditto....(Thanks Susa'n:))
I found this (Ref Drakmyth):-(Hopefully it's still applicable)
Quote:
[Obscure] Spoiler: Log-in Problems
I'm getting "Authentication Failed. Please try again. Account not found."
This means the Auth server does not recognize your Account Name. Your account name is the email address you used to register your account. If you have correctly input that email address and are still receiving this error, try re-registering.
I'm getting "Authentication Failed. Please try again. Incorrect password. Make sure CAPS LOCK is not on."
1. The password you entered does not match the one set for the account. If you have correctly input your password and are still receiving this error, you can reset your password here.
2. Passwords of 16 or more characters in length will fail. Use the password reset option, and change your password to one of not more than 15 characters, and try logging in again.
I'm getting "Authentication Failed. Please try again. Login Denied." OR
I'm getting "Authentication Failed. Please try again. Disconnected from Myst Online." OR
I'm getting "Authentication Failed. Please try again. Unable to connect to Myst Online."
These errors simply indicate that the Authentication Server is down. There is no solution except to wait for Cyan to bring it back up. There have also been reports of this error occurring due to high ping rates when using a satellite internet connection. The only known solution in this case is to use a different, faster, connection.
I'm stuck at "Starting URU, please wait..."
This error is most often caused by a firewall blocking Uru's connection to Cyan's servers. Make sure, if you have a firewall installed, that you mark UruExplorer.exe (and optionally UruLauncher.exe) as an exception.
At:- https://mystonline.com/forums/viewtopic.php?f=40&t=19424
Might be useful for next time, too 
) And there is more there, for other failure announcements....
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