Logon issues with Frostwolf

So, I can't seem to connect through the logon screen in Frostwolf, I have replaced my WTF, Chache and Interface folders but with no results.
I know my login and password are correct so that's not the issues either. I also have ran the client on administrator and that didn't seem to fix the problem either.

Any suggestions?

well you can always try to go to " properties " of the game folder and uncheck "read only" then "apply " . wont hurt and close the game before that ofc .
and try again