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I've found a theme about ix web hosting and thought that it can be others problem, so I quote it here.
I hope it will be usefull.

Problem

"my problem lies with dotnetnuke. I've installed it on one of my domains and now I'm trying to setup portals for my other domains and I can't seem to get it to work. Let me explain.
I've got 2 domains lets call them domain1.com and domain2.com
i've installed dotnetnuke in a subfolder on domain1.com\dotnetnuke.
Within DNN i've got 2 portals, the default is for domain1.com and the other is for domain2.com. Both portals work fine, problem is mapping www.domain2.com to the portal within domain1.
I've tried using directory indexes but when I try to navigate to www.domain2.com I get the error "Directory Listing Denied". If I navigate to the true url, www.domain1.com/dotnetnuke/domain2 then it works fine. I've added the portal alias in DNN and according to the documentation, that's all I need to do.

So my question is, has anyone got dotnetnuke running multiple portals with ixwebhosting? "

answer

"All the documentation I've read online suggests that if you want a url e.g. www.xyz.com to point to a portal in dotnetnuke, all you do is create a portal and give it the alias of the url you want. Then from you domain (i.e. www.xyz.com), point it to the ip address of your dotnetnuke installation.
Since ixwebhosting doesnt' allow you to change your ip, this meant that I had to change my DNS A records. I changed them to point to my dotnetnuke installation and it's worked. It may take some time for it to work as expected, (mine took around 1 day), but now it's working fine."

Reference:
http://www.ixwebhostingforum.com/showthread.php?t=66&highlight=problem