Only one SSL enabled Internet Site document is allowed per IP address.
And you will want to enter the ip address in the document "servers/internet sites " in field "Host names or addresses mapped to this site:"
Internet Site documents work by retrieving the Host header sent by the client. For a Web browser, this Host header is the server name or IP address entered in the URL. Domino compares this header to the Internet Site documents and uses the matching site (or the default if no specific match).
See this technote -> http://www-01.ibm.com/support/docview.wss?uid=swg21173919