I am trying to configure DNS on my domain, however, I can only get it to work with the www prefix.

Right now I have the following DNS A records:

@             A   123.456.789
www           A   123.456.789

http://www.mydomain.com works perfectly. But http://mydomain.com fails.

I've tried all of the following:

mydomain.com  A   123.456.789
mydomain      A   123.456.789
*             A   123.456.789

But it always goes to port :80 requires a username and password. Except now it's somehow being redirected to a spammers website.