Authentication Failed - All Accounts

[Stringbean]

So I was hankering for some sweet sweet Warhammer RvR pvp. Happened upon this private server and thought to myself "awesome, can't wait to get my Blackguard on". But lo' and behold, "Authentication Failed" pops up after the game loads in a critical error window.

I looked around, "try a new account with a password not containing numbers" Okay. Nope.
"Get Hot Shield VPN, THEN log in with an account not containing numbers" Okay. Nope.
I've created three different accounts, and not a single one works...

Any clue how to work around this? It just seems this server is not in my cards and I really wanna play this game again