Thank you so match ,I found the solution ,the problem is network configuration ,but now my problem is the application is heavy because the distance is great,but I will work...

Thank you the configuration network is good , and my connection string like that :

"Data Source=xxxx.xxx.xxxx.xxxx,1433;Network Library=DBMSSOCN;Initial Catalog=Elite;User Id=sa;Password=pass;"

this is my private IP adress : xxxx.xxx.xxxx.xxxx;

this connection string maybe failed...