How to change public address

I have artifactory installed on host A on port 8081 but the service is available to the outside world through host B on port 80. So the public url to access it is http://B/artifactory.

The problem is that all maven spinets that artifactory generates for inclusion are using the http://A:8081/artifactory url.
So, is there a way i can configure artifactory to use a different host and port ?

Thanks.