There's a difference between users that can login to the ISPConfig system and system users. Please compare http://www.ispconfig.org/downloads/m..._src.htm#3_2_1
System users have a prefix like web1_ and cannot login to ISPConfig, but they can use email and FTP. ISPConfig users can use ISPConfig, but htey are no system users and cannot use email and FTP.
I'm also having a hard time getting DNS to work. I registered the domain, but when I try to use ns.archsupply.com as the nameserver it says it doesn't exist.
Does ns.archsupply.com exist? Can you describe more precisely what you did?