PrestaShop multi store not working for sub-domain.

[Radhanatha]

Hello,

I have setup multi store in PrestaShop version 1.6.1.1.0. My main store (http://www.neutralpromotion.se/eprint) is working fine and also all child stores are working fine if I set as all "Virtual URL" in PrestaShop admin like as http://www.neutralpromotion.se/eprint.

Apart form that i have added some sub-domain, these are www.reklamfabrik.se, www.sportandbusiness.se, www.grafixa.se  like this.

All these are working fine for me.

But another sub-domain "http://eprint.profilprodukter.eprint.se" is  not working . Only there is no prefix "www".But same IP address.

All the sub-domain and domain are same IP as well as  pointing to main store's  documentroot.

Any one please help me.

Thanks.