Well I came across this way by chance. Im playing in china due to work but always when I try to log into my ps3 I would have a 11070 error. Although alot of people told me to do the cookie in the ps3 system thingy. It doeant work for me. So I looked online and accidentally used a function on my laptop in cmd then ipconfig /flushdns. After using it the 11070 issue disappear. Only thing is I have to do it everytime

So for everyone who has a 11070 u can try ur luck using the above function and hope it works for you