Central Administration Remote Access
If you want to access your SharePoint Central Administration site remotely, it is possible to do this. 
At the time of setting up your SharePoint installation, Central Administration site will be setup on a particular port. It won’t be on default IIS port 80.
Depending on your installation method (unattended or interactive), Central Administration port will be anything but 80.
Let’s assume the port number is 8000. In that case you will be able to access your SharePoint Central Administration site using http://%servername%:8000
Point to note: If you are accessing this site through a firewall, you will need to open up this port (8000) on your router.
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