Guest OS RDP keep Failed

[oktri]

Hello

Im trying to enabling RDP in my guest OS (windows 7)

looking at the DOC online stated that i need to port forward 3389 to my HOST OS
im also installing openSSH where i did success accessing my Guest From www (internet) but for RDP it didnt work out ,it just timed out

My Host OS is Centos where im also installing Xrdp (also used port 3389)
im not quite sure why it failed (maybe port conflict?)

is it posible to RDP my guest OS from outside of network (ie. my home internet)