The username and password combination you are using is incorrect usually produces that error.
You don't say how you are trying to publish. FTP? Frontpage? Dreamweaver?
Welcome to the forum Dave.
A shared SSL certificate is provided on virtual accounts. Reseller accounts require that you purchase an SSL certificate. You can purchase one for your customer's account.
Only way you can purchase an SSL certificate for a reseller account to share among your customers is with a dedicated server.
Welcome to the forums Lukeman.
You need to ask this question through the help desk. The mods here are volunteers and don't have access to the servers or that information.
The IP numbers you are wanting to ban are not real IP numbers. Real IP numbers can only go to 255.255.255.255
However, IP banning will have no effect on email and you would need to write some sort of filter to ban by IP number.