I tried to connect a C++ application to SQL server using ODBC .. When using the local computer name , connection is Ok. Using the TCI/IP adress of the local host, it's not working. I enable a lot of SQL features. But I don't know if the port 1433 is open. When I check with Tellet , it fails (could not open connection to the host on port 1433) How can I know if Norton Firewall is blocking port 1433 ? How can I open specifically port 1433 ?