If you are behind router you must forward port 1433 to your server ip, also be sure you open this port in firewall and last you must have enabled (is on by default on MSSQL 2008/2012 if i'm not wrong) remote access to database.
After you have done all this you could try to telnet your IP

ort to see if it's done or just try it on your web.
Quote:
Windows 7 require you to install telnet from
Turn windows features on off in Control Panel\Programs and Features