sql server - Cannot connect to SQL database (hosting from home) -

I recently installed Windows Server 2012 and IIS because I host the website (inside my network) from home Wanted.

I was able to host simple static site easily, but now when I want to deploy ASP.NET site which uses a SQL Server database, I have problems

From this tutorial, I have a "published" site from Visual Studio http: //youtu.be/DQgbOIjWgBs?t=6m

and what error I have here:

I have installed SQL Server Management Studio and added it to the database, in IIS I have set up the database name and server, so I believe that it is also fine.

The firewall is disabled (so far unless I do not work it).

Here is the SQL Server set up from IIS

I do not know where the problem is, maybe in permission? (I can usually see the static page, the website folder is located in the InsSetub folder)