DNS Fail?

[newer]

I try to connect 101 by old xxx.xx.xxx.xx5 then I have dns fail?but if I enter xxxxx.xv(letter)then connect fail?so what mean dns fail?
thank you

[Sp0iler]

DNS Fail:
1- The info you entered is incorrect
2- The server was offline when you were looking
3- No such server at that ip addy

[elk10]

I try to connect 101 by old xxx.xx.xxx.xx5 then I have dns fail?but if I enter xxxxx.xv(letter)then connect fail?so what mean dns fail?
thank you

It should look more like xx.x.xxx.xx5

[newer]

I'm sure I did enter right number,i will try different box
thank you all friends