I used to host my phpnuke site on spaceports some time ago, before I changed to another provider. here are the settings:
$dbhost = "localhost";
$dbuname = "your name for the spaceports cgi server, not for spaceports html server";
$dbpass = "your password for cgi server";
$dbname = "again the name for the cgi server";
$system = 0;
$prefix = "nuke";
$user_prefix = "nuke";
$dbtype = "MySQL";
consider, however, that spaceports is slow, that it prevents connecting to their cgi server from other servers by checking your referrer and that their hard disc space is small and if the server hard disc is full, it will take weeks until they insert a new one, while in the mean time everything that is written on harddisc (like the counter number in a txt file) will be set to zero, since the php and cgi scripts won't be able to write to harddisc, because it is full. that's why I changed