can you connect with an ODBC test utility (for example isql) to the SQL Server database?
To get isql to work you need to make sure the ODBC environment is properly sourced (LD_LIBRARY_PATH) and the ODBCINI environment variable is set.
then call the test utility isql like:
isql -v <ODBC DSN> <UID> <PWD>
for example: isql -v TANDOIEPS_LECCE_INI <UID> <PWD>
BTW, when you do not specify the odbc driver in the odbc.ini and use odbcinst.ini, please also make sure the ODBCINITINI environment variable is set correctly.
as long as isql does not work dg4odbc will fail as well.
I commonly do not like the mixture of having so many config files (odbcinst.ini, freetds.conf and odbc.ini) and prefer to have everything in one file. Let's add another alias to the odbc.ini file:
Server = 10.90.2.132
Database = AdventureWorks
Database = TandoiEps
Port = 1434
TDS_Version = 8.0
Are you now able to connect to the database with isql using the newly created FreeTDS ODBC DSN?
if not, what happens when you telnet to this machine:
telnet 10.90.2.132 1434
BTW, I'm also wondering why the SQL Server is using the 1434 port in your config, did you cross check that with the MS SQl Server Configuration Manager => SQl Server Network Configuration => TCP/IP?