Connection problem from php : Unable to connect to data source, SQL state S1000 in SQLConnect

Hello everybody, 
 
I have difficult to connect from php to MS SQL Server. I have the following message in php page :
 
[unixODBC][FreeTDS][SQL Server]Unable to connect to data source, SQL state S1000 in SQLConnect
 
 
I made an installation Freetds via yum install . I configured freedts.conf in /etc/ folder .
 
Here is the code in /etc/freetds.conf
 
#   $Id: freetds.conf,v 1.12 2007/12/25 06:02:36 jklowden Exp $
#
# This file is installed by FreeTDS if no file by the same
# name is found in the installation directory.
#
# For information about the layout of this file and its settings,
# see the freetds.conf manpage "man freetds.conf".
# Global settings are overridden by those in a database
# server specific section
[global]
        # TDS protocol version
;       tds version = 4.2
        # Whether to write a TDSDUMP file for diagnostic purposes
        # (setting this to /tmp is insecure on a multi-user system)
;       dump file = /tmp/freetds.log
;       debug flags = 0xffff
        # Command and connection timeouts
;       timeout = 10
;       connect timeout = 10
        # If you get out-of-memory errors, it may mean that your client
        # is trying to allocate a huge buffer for a TEXT field.
        # Try setting 'text size' to a more reasonable limit
        text size = 64512
# A typical Sybase server
;[egServer50]
;       host = symachine.domain.com
;       port = 5000
;       tds version = 5.0
# A typical Microsoft server
;[egServer70]
;       host = ntmachine.domain.com
;       port = 1433
;       tds version = 7.0
[TDS]
        host = <My IP Address>
        port = 1433
        tds version = 8.0

 
Here is my /etc/odbcinst.ini file :
 
[PostgreSQL]
Description             = ODBC for PostgreSQL
Driver          = /usr/lib/psqlodbc.so
Setup           = /usr/lib/libodbcpsqlS.so
Driver64                = /usr/lib64/psqlodbc.so
Setup64         = /usr/lib64/libodbcpsqlS.so
FileUsage               = 1
 
[MySQL]
Description             = ODBC for MySQL
Driver          = /usr/lib/libmyodbc5.so
Setup           = /usr/lib/libodbcmyS.so
Driver64                = /usr/lib64/libmyodbc5.so
Setup64         = /usr/lib64/libodbcmyS.so
FileUsage               = 1
 
[FreeTDS]
Description             = v0.64 with protocol v8.0
Driver          = /usr/lib64/libtdsodbc.so.0
ForceTrace      = Yes
Trace           = Yes
TraceFile       = /tmp/sql.log
UsageCount              = 1
 
And this my php code to connect to SQL Server :
 
$connexion_mssql_reussie = true;
 
$dsn="Driver=FreeTDS;Server=<My IP Address>;Database=<My database>;UID=<User name>;Pwd=<My password>";
if(($conn=odbc_connect($dsn,'','')) == TRUE){
 $connexion_mssql_reussie = true;
}else{
 die("Erreur de connexion");
 
}
 
 
I use a CentOS web server and SQL Server 2008 with Windows 2008 server .
 
I would like to know if I forgot something .
 
Thank you for your reply .
 
Best regards.