I am having the same problem;

there must be a solution. PLease help.

Thanks.

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http://www.worldarab.net

i had it installed in the root directory, not in the virtual directory, and it still never worked when it comes to child portals.
like i said, i respect them for providing huge bandwidth and disk space for good money plus unlimited domains etc, unlike some rip-offs out there. but they should never have put dotnetnuke on the list of their supported software, even their virtual directory install never worked for me.