5
muntinlupa is not a DNS name, it is your computers NetBIOS name. Should serve the same function though, as all you need it a human friendly name to resolve to the correct IP address.
One thing to note though is that you are using the name of muntinlupa/xoops . This means that your webservers root directory is mounted one directory above your XOOPS root directory. If you computer name is muntinlupa, then I don't see this being a name resolution issue, I probably see it being more along the lines of being a webserver issue.
What happens if you goto a command prompt and type in;
ping muntinlupa
Do you get a reply back? What webserver are you using?