Nostalrius Begins - Quality wow vanilla realm (1.12)

I have this problem my friend can't enter in the game.
We try my own acc who i enter from my PC but from him we can't what do to?
Help!!!
"The information you have entered is not valid. Please check the spelling of the account name and password. If you need help in retrieving a lost or stolen password and account, see http://www.wow-europe.com for more infomation.

Use the correct account name and password.

Remember that the account is not the same as the forum account. Also note that if you try too many times with wrong password, the account will be temporary banned, and you will have to wait some time before you can log in again.

But i enter from my PC without any problem. (We are using TeamViewer)

Mimma wrote:Use the correct account name and password.

Remember that the account is not the same as the forum account. Also note that if you try too many times with wrong password, the account will be temporary banned, and you will have to wait some time before you can log in again.

I am sure that i am writing correctly my name and password.