I followed this guide (http://theitideas.blogspot.com/2012/...on-centos.html) to install xrdp on a centos computer. All of the steps seemed to have worked without any errors, I started the service and everything seems to work up until I try actually logging in. I try using remote desktop on a Windows 7 PC and it can't even connect to it, what gives?

I can post a log file for you guys if you want!

Take a look at this.
http://habeebperk.wordpress.com/2012...os-6-3-x86_64/
&
http://uwot.eu/blog/2013/04/xrdp-and-centos-6/

Have you configured the firewall correctly?

By default the RDP port 3389 is block by the firewall. In order to access the XRDP login screen the TCP and UDP port 3389 need to be allowed through the firewall. These ports can be enable through the Firewall utility.

To open the Firewall utility goto System>Administration>Firewall. On the left hand side select Other Ports. This with take you to the other ports window where you can add the TCP 3389 and UDP 3389 ports so they will be allowed through the firewall. Select the add+ button to open the add port window. Scroll down until you see port 3389 TCP ms-wbt-server select it and press OK. Next select the add+ button again and select the port 3389 UDP ms-wbt-server and select OK. You should now see both TCP and UDP 3389 port in the allow other port list. Select the Apply button to apply the changes. Select Yes on the conformation screen and then close Firewall utility.