When a visitor create an account and a blog, the blog url is not working

Thanks for your quick response. Here are some more details for you.

We have setup the WPMU in subdirectory structure as follows -

ourweddingnews.com/sumon9own/

Also we have not setup any SSL or other security plugin. And we have hosted our site in managed wordpress hosting of godaddy.com;

Here are some other broken urls for your further reference.
ourweddingnews.com/sumon9own/
ourweddingnews.com/sumon11own/

Thanks,