Hi there! I know, there are a lot of posts about my question. I read almost of them and got some progress. I need to access a database in a SQLServer Express Edition installed in another machine. I'm using the following connection string: Data Source=192.168.0.100,1433;Network Library=DBMSSOCN;Initial Catalog=NorthWind;User ID=DESKTOP\ORIC;Password=12345; Where: 192.168.0.100 = server IP address (I got it from SQL Server TCP/IP property) 1433 = TCP (I got it from SQL Server TCP/IP property) DESKTOP\ORIC => DESKTOP = machine's name where the SQL server are installed, ORIC = my user name in that machine (I'm administrator) 12345 = My Windows login password (in SQL Server computer). When I run my application from a remote machine I got the following error message: