Fail to connect in the HP Web Service

Hey guys, 

I just got one HP Laserjet CP1025nw and wanna set up the wireless eprint on my MAC. Now I am at the stage of using HP Web Service to enable the printer. The problem is that when I clicked the HP Web Service tab and and clicked "Enable" button, after 5 seconds it simply showed "connection error, check internet connection".  I have checked and my MAC and the printer are in the same wifi environment and the IP address is the same as the configuration paper. I have no idea what to do in the next step. I don't think the printer is too far to have a good connection as the signal shows approximately 4 boxes out of 5. 

I will be appreciated if someone could help me out.

Thanks