You can't send somenone to another port. By entering www.abc.com the user says he wants port 80. You must do the following:
If you have only one IP address, you will use one http listener and two virtual servers. Virtual servers will be identified by their host-names. One virtual server will accept requests for host www.abc.com and the other server www.def.com. Default web module for server www.abc.com must be webapp1 and www.def.com must be webapp2.
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