Configuration multistore - http address without www redirect to others

HI,
I have configured several store in unique nop (4.6.0.5) installation with different languages.
Every single site working fine if http address starts with www; if address starting without www the web site is redirected to first store!
I've updated CNAME and IIS binding in several way but without success.

Any suggestion, please?

Thanks in advance

In NopCommerce I can think of two settings which may control the redirection
1. Redirection to www if it is forced (i.e. at /Admin/Setting/GeneralCommon page under SEO section there is a field named WWW prefix requirement. If you don't want to force the redirection to www then set the value to  Doesn't matter )
2. Redirection to HTTPS if the request is from HTTP when the store has the SslEnabled set at /Admin/Store/Edit/{id}

Other than these the redirection is controlled by config and third-party plugin that facilitates so if you are using any plugin for redirection then you need to check the rules that are configured over there

Thanks for the suggestion... I had bad result anyway. Some improvement with right HOST values into the store configuration (added also sites without www into the value)

I will work to check again.

Thanks