SubDir not resolving in DomainMapping

Domain Mapping: http://www.muremedia.com root network
I am trying to point muremedia.com/poc to poc13.com
Domain Mapping plug installed and I am on a windows server.
DNS A record point to same ip address, and muremedia.com is using dedicated IP
I am only able to get to the top, muremedia.com, not the sub-dir /poc via the new domain (poc13.com)
Can you help?