This error sometimes occur in PSP connection that DNS error occurs so you can’t connect to internet, there are two methods to fix it, follow the simple steps below to fix
Turn off the wireless router for 3 to 5 minutes.
Then try to connect to the PSP.
A CD comes with a wireless router to setup the information of the wireless network so insert it.
Put in the information needed eg. SSID, WEP,....
Try now to connect to the PSP
Be sure that you turned the WI-FI switch on.
Try to reset the router from the same device if all above did not work.