newbie question regarding mirroring

Hi,
I was trying to do a database mirroring( for learning purposes). But the mirroring process failed.
I am currently having sql server 2005 developer edition, installed in physically two different machines.
It gives me an error that there is some error : with the network address I have specified.
Note: I have created these settings through SSMS.
The network address is as TCP://<machine>:5022
for both the mirror and principal.
Also, if possible can some one please help me restore the mirrored database in the previous state:
I mean: I had to restore it with the current back up with recovery on.
It is still in Restoring state
I hope You get my point.
Please reply as soon as possible.