You should either enable the hostname "blogengineforum.net" in IIS for this web or - better - make a redirection to "www.blogengineforum.net"
It's confusing when there is a entry in the DNS but the IIS delivers only a "Bad host name" error.
(I'm no friend of the needless www-subdomain, but that's another point

)
Greets,
Anheledir