Yeah, if you know that the details are correct and you've used them before. It might take time for the update to take effect too. I think I had to wait 24 hours as it was not instant... but saying that I think that was only the first time since then its been fine!
You could even test it with another host try out: http://www.freemysql.net/v2/
You can set up a free MySQL quickly with them as a test, I used to connect to one with out any trouble or extra settings.
This is the server name (for when/if you need it): SQL09.FREEMYSQL.NET
goodluck