Does SQL Server logs Database Connection Error ?

Hi,

There is an application using ODBC connection with SQL Server 2008R2 as Backend.

Business Analyst reports that some users have connection problem and cannot access the database at backend. Our Network Administrator says that it is not a Network Problem as the error message is "Cannot connect to Database".

In this way, the BA says that SQL Server must have some logging mechanism to log who / which connection fails and ask me to give her the log file.

As far as I know, we only get Server Log in SQL Server and no such connection log (Please correct me if I am wrong).

I just would like to seek your fellows’ input.

Thanks