Have just added a new server to my system. Was SBS 2003 with SharePoint 2007.
Now Server 2012 R2 with SP Ent 2013.
Alt Access mappings plagued me before. Have a site setup that is http://server:28333/sites
Have an external .com pointing to my server with a static IP.
I went admin and tried to configure the external site to my internal through alternate mappings. Site as default and www address as internet. No go. 404 page. Any help? looked at my 2007 settings and their clues aren't really meaningful.