I fuss that's the reason! But I'm not able to change it throughout the web.config because my hosting provider has set in it's machine.config "allowOverride=false". So I guess I'm hopeless unless I ask my hosting provider to make the change. That's right? There's no choice to change it if my site root has "allowOverride=false" and I cannot change it. Ain't it?

Not too bad, until I can download my DNN SQL DB and make changes in my localhost machine and then update my DB again in my hosting provider.

Thanks you all guys!

Best wishes!

Yep! You're right! But:

1. I've not found till now another hosting provider cheaper than mine with 25$/year for hosting + 10$/year for MSSql
2. I don't change host and admin settings too much.

Of course I'm glad to know whether there exists hosting providers cheaper than mine!

Thank a lot to you all!

Yes, that's great you can find other hosting provider that provide best service and more affordable. You can find other prvider on dnn forums too