Cannot register default instance of sql
-windows server 2008 -sql server 2008 r2 i trying register default instance in management studio. when try, error saying cannot connect instance. have tried type <servername>/<instance> in server field, not work either. i can register 2005 express instance, not 2008 standard instance. have verified services started. can help? david i added firewall rule, still did not work. changed server name <servername> , connected. reason, since used default instance, not use <servername>/<instance>, instead used <servername> , worked. thank help. david SQL Server > SQL Server Setup & Upgrade